diff --git a/Gemfile.lock b/Gemfile.lock
index 01db6b3..ab0c0e1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -65,7 +65,6 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    wdm (0.1.1)
 
 PLATFORMS
   ruby
@@ -80,7 +79,6 @@ DEPENDENCIES
   kramdown
   kramdown-parser-gfm
   rouge
-  wdm (>= 0.1.0)
 
 BUNDLED WITH
-   2.1.4
+   2.2.11
diff --git a/_config.yml b/_config.yml
index d140cd7..7263aea 100644
--- a/_config.yml
+++ b/_config.yml
@@ -58,6 +58,6 @@ adsense-data-ad-client: "ca-pub-4206814002327904"
 adsense-data-ad-slot: "1363087678"
 
 # Lazy Images ("enabled" or "disabled")
-lazyimages: "disabled"
+lazyimages: "enabled"
 
 exclude: [changelog.md, LICENSE.txt, README.md, Gemfile, Gemfile.lock]
diff --git a/_pages/about.md b/_pages/about.md
index 3514b2d..8d1f1c3 100644
--- a/_pages/about.md
+++ b/_pages/about.md
@@ -8,12 +8,12 @@ comments: false
 <div class="row justify-content-between">
 <div class="col-md-8 pr-5">
 
-<p>Hello 👋🏼 its Gaurav, 
+<p>Hello 👋🏼 I am Gaurav, 
 let's find out what is coderolls.</p>
 
-<p>coderolls is a blog about coding. Here I do write articles about Java programming language, Spring Framework, Hibernate, SQL, GIT and many related technologies. </p>
+<p>coderolls is a blog about coding. Here I do write articles about Java programming language, Spring Framework, Hibernate, SQL, GIT, and many related technologies. </p>
 
-<p>At coderolls I am trying to write easy to undersatnd but in detail tutorials. I am writing few examples in the tutorials which elaborate the conecpt.</p>
+<p>At coderolls, I am trying to write easy-to-understand but in detail tutorials. I am writing few examples in the tutorials which elaborate the concept.</p>
 
 <p>If you have any questions please feel free to reach us at hello@coderolls.com</p>
 
@@ -39,7 +39,7 @@ let's find out what is coderolls.</p>
 
 <h4>About Gaurav</h4>
 
-<p>"Hi 👋🏼 I'm Gaurav Kukade, a software developer. Here I write tutorials for Java programming language and related technologies."</p>
+<p>Hi 👋🏼 I'm Gaurav Kukade, a software developer. Here I write tutorials for Java programming language and related technologies.</p>
 
 <p>I like to try new things in the world of coding.</p>
 
@@ -54,7 +54,7 @@ You can connect with me on <a href="https://linkedin.com/in/gauravkukade/">Linke
 <div class="sticky-top sticky-top-80">
 <h5>Buy me a coffee</h5>
 
-<p>Thank you for your support! Your donation helps me to maintain and improve <a target="_blank" href="/">coderolls <i class="fab fa-github"></i></a>.</p>
+<p>Thank you for your support! Your donation helps me to maintain and improve <a target="_blank" href="/">coderolls<i class="fab fa-github"></i></a>.</p>
 
 <a target="_blank" href="https://paypal.me/GauravKukade" class="btn btn-success">Buy me a coffee ☕</a>
 
diff --git a/_posts/groovy/2020-12-31-hello-world-in-groovy.md b/_posts/groovy/2020-12-31-hello-world-in-groovy.md
index b9c320c..8f937e1 100644
--- a/_posts/groovy/2020-12-31-hello-world-in-groovy.md
+++ b/_posts/groovy/2020-12-31-hello-world-in-groovy.md
@@ -2,7 +2,7 @@
 layout: post
 title: "Hello World In Groovy"
 author: gaurav
-image: assets/images/2020-12-31/groovy-logo.png
+image: assets/images/2020-12-31/groovy-logo.webp
 categories: [ Groovy]
 description: "In this article you will say 'Hello' to Groovy. We will see the installation and 'the' most important 'Hello World!' program."
 featured: false
@@ -23,7 +23,7 @@ Here is a [link for Windows Installer for Groovy 3.0.7](https://bintray.com/groo
 
 Once you download the .msi file ( i.e. installer) simply double click on it and you will see the installation screen.
 
-![Groovy Installation Screen](/assets/images/2020-12-31/groovy-installation-screen.png)
+![Groovy Installation Screen](/assets/images/2020-12-31/groovy-installation-screen.webp)
 
 The installation is pretty simple and straight-forward. Click on next and go with the default setting.
 
@@ -37,7 +37,7 @@ Refer to the [official installation guide](https://groovy-lang.org/install.html)
 
 Once you are done with the installation, you can search for the Groovy Console from your start menu. And finally, you are ready to write your first "Hello World!" program.
 
-![Groovy Console in the Start Menu](/assets/images/2020-12-31/groovy-console-in-start-menu.png)
+![Groovy Console in the Start Menu](/assets/images/2020-12-31/groovy-console-in-start-menu.webp)
 
 
 ## Hello World In Groovy
@@ -55,7 +55,7 @@ Open your Groovy Console. Add the following statement to it.
 ```groovy
 println "Hello World!"
 ```
-![Groovy Hello World Program In the Groovy Console](/assets/images/2020-12-31/groovy-hello-world-program-and-run-option.png)
+![Groovy Hello World Program In the Groovy Console](/assets/images/2020-12-31/groovy-hello-world-program-and-run-option.webp)
 
 To run your program right click on the console and choose the 'Run' option.
 
@@ -65,7 +65,7 @@ Boom!! 🎉
 
 You can see the string "Hello World!" is printed on the console. 
 
-![Groovy Hello World Program Output](/assets/images/2020-12-31/groovy-hello-world-output.png)
+![Groovy Hello World Program Output](/assets/images/2020-12-31/groovy-hello-world-output.webp)
 
 So you have successfully written your first groovy program.
 
@@ -85,4 +85,4 @@ You can support me by [giving a cup of Coffee ☕](https://www.paypal.me/GauravK
 - [Learn About Java String Pool And intern() Method](https://coderolls.com/java-string-pool-and-intern-method/)
 - [How Do I Compare Strings In Java](https://coderolls.com/compare-strings-in-java/)
 - [Compare Two Strings Lexicographically In Java](https://coderolls.com/compare-two-strings-lexicographically-in-java/)
-- [Difference Between StringBuffer and StringBuilder class](https://coderolls.com/difference-between-stringbuffer-and-stringbuilder/)
\ No newline at end of file
+- [Difference Between StringBuffer and StringBuilder class](https://coderolls.com/difference-between-stringbuffer-and-stringbuilder/)
diff --git a/_posts/java-basic/2019-11-29-java-introduction.md b/_posts/java-basic/2019-11-29-java-introduction.md
index 80f4c9b..27dd931 100644
--- a/_posts/java-basic/2019-11-29-java-introduction.md
+++ b/_posts/java-basic/2019-11-29-java-introduction.md
@@ -27,7 +27,7 @@ Let’s understand Java as a programming language.
 
 Java is a high-level programming language. It is a concurrent, class-based, object-oriented programming language.
 
-![Java Language Feature](/assets/images/2019-11-29/java-language-feature.png)
+![Java Language Feature](/assets/images/2019-11-29/java-language-feature.webp)
 
 We will understand Java by the following simple terms, let’s discuss one by one,
 
@@ -136,7 +136,7 @@ When we compile this file with the javac compiler, the .class file will be gener
 
 Refer the following diagram,
 
-![How Java Code Works](/assets/images/2019-11-29/how-java-code-works.png)
+![How Java Code Works](/assets/images/2019-11-29/how-java-code-works.webp)
 
 What was your experience when you started learning Java, share with us in the comment section.
 
diff --git a/_posts/java-files-io/2021-01-03-read-file-using-bufferedreader.md b/_posts/java-files-io/2021-01-03-read-file-using-bufferedreader.md
index f4f4c60..71cbcf5 100644
--- a/_posts/java-files-io/2021-01-03-read-file-using-bufferedreader.md
+++ b/_posts/java-files-io/2021-01-03-read-file-using-bufferedreader.md
@@ -2,7 +2,7 @@
 layout: post
 title: "How To Read File Using BufferedReader In Java?"
 author: gaurav
-image: assets/images/2021-01-03/read-file-using-bufferedreader.png
+image: assets/images/2021-01-03/read-file-using-bufferedreader.webp
 categories: [Java, Java File IO]
 description: "In this article we will see how to read a file using the `BufferedReader` class in Java."
 ---
diff --git a/_posts/java-string/2019-11-30-compare-two-strings-lexicographically-in-java.md b/_posts/java-string/2019-11-30-compare-two-strings-lexicographically-in-java.md
index 951ca18..116bb3c 100644
--- a/_posts/java-string/2019-11-30-compare-two-strings-lexicographically-in-java.md
+++ b/_posts/java-string/2019-11-30-compare-two-strings-lexicographically-in-java.md
@@ -30,7 +30,7 @@ Java `compareTo()` method Compares two strings lexicographically, The comparison
 
 The character sequence represented by the String object is compared lexicographically to the character sequence represented by the argument string.
 
-![Showing which one is the argument string](/assets/images/2019-11-30/compareto-method-string-def.png)
+![Showing which one is the argument string](/assets/images/2019-11-30/compareto-method-string-def.webp)
 
 ```java
 int compareTo(T o)
@@ -104,12 +104,12 @@ Compairing character sequence of fourthString (Cheese) to the character sequence
 Explanation:
 1. In first case,`compareTo()` method returns zero since firstString and secondString are same.
 2. In second case, `compareTo()` method returns 14 since secondString follows thirdString by 14 characters. The pictorial explanation for this case is given below.
-![An explanation for the second case of the java program for `compareTo()` method](/assets/images/2019-11-30/comapreto-method-secondstring-compareto-thirdstring.png)
+![An explanation for the second case of the java program for `compareTo()` method](/assets/images/2019-11-30/comapreto-method-secondstring-compareto-thirdstring.webp)
 
 3. In third case, `compareTo()` method returns -1 since thirdString precedes fourthString by 1 character.
 4. In last case, `compareTo()` method returns -13 since fourthString precedes firstString by 13 characters. The pictorial explanation for this case is given below.
 
-![An explanation for the fourth case of the java program for `compareTo()` method](/assets/images/2019-11-30/comapreto-method-fourthString-compareto-firstString.png)
+![An explanation for the fourth case of the java program for `compareTo()` method](/assets/images/2019-11-30/comapreto-method-fourthString-compareto-firstString.webp)
 
 ## 2. By creating a user-defined method
 
diff --git a/_posts/java-string/2019-12-02-reverse-a-string-in-java.md b/_posts/java-string/2019-12-02-reverse-a-string-in-java.md
index a797f06..aebc940 100644
--- a/_posts/java-string/2019-12-02-reverse-a-string-in-java.md
+++ b/_posts/java-string/2019-12-02-reverse-a-string-in-java.md
@@ -85,11 +85,12 @@ In the `for` loop, I have assigned `blogName.length()-1` to i instead of `blogNa
 
 I have given an image below to show the string indexing.
 
-![Showing indexes of the characters in the string.](/assets/images/2019-12-02/string-indexing.png)
+![Showing indexes of the characters in the string.](/assets/images/2019-12-02/string-indexing.webp)
 
 Also you can watch [the video on my youtube channel for reverse a string with the above method](https://www.youtube.com/watch?v=vrTYrQuB0BE).
 
-[![How To Reverse A String In Java](https://img.youtube.com/vi/vrTYrQuB0BE/0.jpg)](https://www.youtube.com/watch?v=vrTYrQuB0BE "How To Reverse A String In Java")
+<iframe width="560" height="315" src="https://www.youtube.com/embed/vrTYrQuB0BE" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+
 
 ## 2. Using `getBytes()` method of String
 In the `getBytes()` method of Java String first encodes the specified string into the sequence of bytes using the platforms default charset and then save the result in the byte array. The same byte array will be returned.
diff --git a/_posts/java-string/2019-12-10-compare-strings-in-java.md b/_posts/java-string/2019-12-10-compare-strings-in-java.md
index e38f79f..2d0094c 100644
--- a/_posts/java-string/2019-12-10-compare-strings-in-java.md
+++ b/_posts/java-string/2019-12-10-compare-strings-in-java.md
@@ -176,7 +176,7 @@ If it is present in the string pool, the reference to the memory address of that
 
 The following image shows the pictorial explanation of the same.
 
-!['firstString' pointing towards the "coderolls" string in string pool](/assets/images/2019-12-10/firstString-pointing-to-coderolls-in-string-pool.png)
+!['firstString' pointing towards the "coderolls" string in string pool](/assets/images/2019-12-10/firstString-pointing-to-coderolls-in-string-pool.webp)
 
 ‘firstString’ pointing towards the “coderolls” string in string pool
 
@@ -186,13 +186,13 @@ Since the string object with that value is already created in the previous step.
 
 The following image shows the pictorial explanation for the same
 
-!['firstString' and 'secondString' pointing towards the "coderolls" string in string pool](/assets/images/2019-12-10/secondString-pointing-to-coderolls-in-string-pool.png)
+!['firstString' and 'secondString' pointing towards the "coderolls" string in string pool](/assets/images/2019-12-10/secondString-pointing-to-coderolls-in-string-pool.webp)
 
 ‘firstString’ and ‘secondString’ pointing towards the “coderolls” string in string pool
 
 When we create string using the  `new`  operator, a new string object is created and stored in the Java heap space.
 
-!['firstString' and 'secondString' pointing towards the "coderolls" string in string pool and 'thirdString' pointing towards the "coderolls" in java heap space.](/assets/images/2019-12-10/thirdString-pointing-to-coderolls-in-heap.png)
+!['firstString' and 'secondString' pointing towards the "coderolls" string in string pool and 'thirdString' pointing towards the "coderolls" in java heap space.](/assets/images/2019-12-10/thirdString-pointing-to-coderolls-in-heap.webp)
 
 ‘firstString’ and ‘secondString’ pointing towards the “coderolls” string in string pool and ‘thirdString’ pointing towards the “coderolls” in java heap space.t
 
@@ -202,7 +202,7 @@ When we create string using the  `new`  operator, a new string object is created
 
 `compareTo()`  method compares the character sequence of the argument string with the character sequence of the specified string.
 
-![Showing argument string and specified string.](/assets/images/2019-12-10/showing-argument-string-and-specified-string.png)
+![Showing argument string and specified string.](/assets/images/2019-12-10/showing-argument-string-and-specified-string.webp)
 
 Showing argument string and a specified string.
 
diff --git a/_posts/java-string/2019-12-12-java-substring-method.md b/_posts/java-string/2019-12-12-java-substring-method.md
index 262ef14..6528cc3 100644
--- a/_posts/java-string/2019-12-12-java-substring-method.md
+++ b/_posts/java-string/2019-12-12-java-substring-method.md
@@ -57,7 +57,7 @@ If the given string is “codeRolls.com” and we applied the substring() method
 
 See the pictorial explanation shown below.
 
-![substring() method explanation with both parameter i.e. beginIndex and endIndex](/assets/images/2019-12-12-java-substring-method/substring-method-with-beginIndex.png)
+![substring() method explanation with both parameter i.e. beginIndex and endIndex](/assets/images/2019-12-12-java-substring-method/substring-method-with-beginIndex.webp)
 
 substring() method explanation with one parameter i.e. beginIndex
 
@@ -126,7 +126,7 @@ Let us take a simple string like “codeRolls.com” and I will apply the  `subs
 
 See the pictorial explanation shown below.
 
-![substring() method explanation with both parameter i.e. beginIndex and endIndex](/assets/images/2019-12-12-java-substring-method/substring-method-with-beginIndex-and-endIndex.png)
+![substring() method explanation with both parameter i.e. beginIndex and endIndex](/assets/images/2019-12-12-java-substring-method/substring-method-with-beginIndex-and-endIndex.webp)
 
 Let us see the full java code for the example stated above.
 
diff --git a/_posts/java-string/2019-12-24-difference-between-stringbuffer-and-stringbuilder.md b/_posts/java-string/2019-12-24-difference-between-stringbuffer-and-stringbuilder.md
index a07f36b..3eb50ad 100644
--- a/_posts/java-string/2019-12-24-difference-between-stringbuffer-and-stringbuilder.md
+++ b/_posts/java-string/2019-12-24-difference-between-stringbuffer-and-stringbuilder.md
@@ -2,7 +2,7 @@
 layout: post
 title: "Difference Between StringBuffer and StringBuilder class"
 author: gaurav
-image: assets/images/2019-12-24-difference-between-stringbuffer-and-stringbuilder/blog-cover.jpg
+image: assets/images/2019-12-24-difference-between-stringbuffer-and-stringbuilder/blog-cover.webp
 categories: [ Java, Core Java, String]
 description: "In this article, we are going to discuss the differences between the `StringBuffer` and `StringBuilder` class. And we will see why it `StringBuilder` is preferable to `StringBuffer` class."
 featured: false
diff --git a/_posts/java-string/2020-12-24-convert-stringbuilder-to-string-in-java.md b/_posts/java-string/2020-12-24-convert-stringbuilder-to-string-in-java.md
index b11945b..56f11c8 100644
--- a/_posts/java-string/2020-12-24-convert-stringbuilder-to-string-in-java.md
+++ b/_posts/java-string/2020-12-24-convert-stringbuilder-to-string-in-java.md
@@ -2,7 +2,7 @@
 layout: post
 title: "How To Convert StringBuilder To String In Java?"
 author: gaurav
-image: assets/images/2020-12-24/convert-stringbuilder-to-string-in-java.png
+image: assets/images/2020-12-24/convert-stringbuilder-to-string-in-java.webp
 categories: [ Java, Core Java, String]
 description: "In this article you will see, how to convert a StringBuilder to String in Java."
 featured: false
diff --git a/_posts/java-uuid/2020-12-19-uuid-in -java.md b/_posts/java-uuid/2020-12-19-uuid-in-java.md
similarity index 97%
rename from _posts/java-uuid/2020-12-19-uuid-in -java.md
rename to _posts/java-uuid/2020-12-19-uuid-in-java.md
index a68278b..6b6332b 100644
--- a/_posts/java-uuid/2020-12-19-uuid-in -java.md	
+++ b/_posts/java-uuid/2020-12-19-uuid-in-java.md
@@ -2,7 +2,7 @@
 layout: post
 title: "Your Guide To UUID In Java"
 author: gaurav
-image: assets/images/2020-12-19/uuid.png
+image: assets/images/2020-12-19/uuid.webp
 categories: [ Java, Core Java, String]
 description: In this article you will learn what is UUID and about the Java UUID class.
 featured: false
@@ -50,7 +50,7 @@ UUID can be used in the following cases
 
 df6fdea1-10c3-474c-ae62-e63def80de0b
 
-![Structure of UUID](/assets/images/2020-12-19/uuid.png)
+![Structure of UUID](/assets/images/2020-12-19/uuid.webp)
 ## Java UUID class
 
 UUID Class belongs to the `java.util` package. It represents an immutable universally unique identifier (UUID).
diff --git a/_posts/java-uuid/2020-12-23-create-uuid-in-java.md b/_posts/java-uuid/2020-12-23-create-uuid-in-java.md
index ec7e6db..2ea991f 100644
--- a/_posts/java-uuid/2020-12-23-create-uuid-in-java.md
+++ b/_posts/java-uuid/2020-12-23-create-uuid-in-java.md
@@ -2,7 +2,7 @@
 layout: post
 title: "How To Create UUID in Java?"
 author: gaurav
-image: assets/images/2020-12-23/create-uuid-in-java.png
+image: assets/images/2020-12-23/create-uuid-in-java.webp
 categories: [ Java, Core Java, String]
 description: "In this article you will see, how to create UUID in Java."
 featured: true
diff --git a/assets/css/screen.css b/assets/css/screen.css
index 5f2d8f5..bdd2321 100644
--- a/assets/css/screen.css
+++ b/assets/css/screen.css
@@ -330,7 +330,7 @@ span.post-read-more a:hover {
 }
 
 .article-post {
-    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
+    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
     font-size: 1.1rem;
     line-height: 1.84;
     color: rgba(0, 0, 0, .8);
@@ -711,7 +711,7 @@ h6 {
 }
 
 .layout-page .article-post {
-    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
+    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
     font-size: 1rem;
 }
 
@@ -933,4 +933,4 @@ right social connect svg's.
 
 .lh-condensed-ultra{
     line-height: 1!important;
-}
\ No newline at end of file
+}
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