This document provides summaries of key features of lists in Ring programming language. Lists allow storing multiple values in a single variable. Key points include: - Lists can be created using square brackets or : operator and items can be added or removed. - Functions like len(), find(), sort(), reverse() etc. allow getting length, searching, sorting and reversing lists. - Lists support nested structures and can be passed to and returned from functions. - String indices can be used to access items in lists containing pairs of string and values. - Lists provide a way to pass variable number of parameters to functions in a flexible order.