Correction to: Mobile Networks and Applications (2021)

https://doi.org/10.1007/s11036-021-01771-z

The original version of this article, published on 5 May 2021, the authors have found an error in the published version of the paper. Typesetter inadvertently added the section heading "2 Conclusion" between "1 Introduction" and "3 Characteristic analysis of educational resource index" sections in the attached published version. This should be deleted.

Original article has been corrected.