Update free-courses-en.md (#4773)

free-courses-en.md

@@ -120,6 +120,7 @@
 
 * [Bento Shell Track](https://bento.io/topic/shell) (Bento)
 * [Shell Scripting Tutorial](https://www.youtube.com/playlist?list=PL7B7FA4E693D8E790)
+* [Shell Scripting Tutorial for Beginners](https://www.youtube.com/playlist?list=PLS1QulWo1RIYmaxcEqw5JhK3b-6rgdWO_) (ProgrammingKnowledge)
 
 
 ### Bootstrap
@@ -231,6 +232,7 @@
 
 * [Bento Git Learning Track](https://bento.io/topic/git) (Bento)
 * [Bento GitHub Learning Track](https://bento.io/topic/github) (Bento)
+* [Git & GitHub Tutorial for Beginners](https://www.youtube.com/playlist?list=PL4cUxeGkcC9goXbgTDQ0n_4TBzOO0ocPR) (The Net Ninja)
 * [Git and GitHub for Poets](https://www.youtube.com/playlist?list=PLRqwX-V7Uu6ZF9C0YMKuns9sLDzK6zoiV)
 * [GitHowTo](https://githowto.com)
 * [How to Use Git and GitHub](https://www.udacity.com/course/how-to-use-git-and-github--ud775) (Udacity)