added new heading of linux and a course in it in free-courses-hi.md (#7351)

* added new heading of linux and a course in it

* added another course in linux

* corrected number of blank lines and alphabetical order

* Update free-courses-hi.md

* revert remove `tch.:`

* YT not need resource notes

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

courses/free-courses-hi.md

@@ -23,6 +23,7 @@
     * [React](#react)
     * [Vue.js](#vuejs)
 * [Kotlin](#kotlin)
+* [Linux](#linux)
 * [Machine Learning](#machine-learning)
 * [PHP](#php)
 * [Python](#python)
@@ -226,6 +227,12 @@
 * [Kotlin Programming Complete in one Video (Hindi)](https://www.youtube.com/watch?v=uoP4JKHgzDE) - Geeky Shows, `tch.:` Rajesh Kumar
 
 
+### Linux
+
+* [Linux Full Course (Beginner to Advanced) \| Learn Linux in Hindi](https://www.youtube.com/playlist?list=PLjVLYmrlmjGcsZGJWeo8ec4yIBLX2KeyR) - WsCube Tech
+* [Linux Tutorial For Beginners in Hindi](https://www.youtube.com/watch?v=_tCY-c-sPZc) - CodeWithHarry
+
+
 ### Machine Learning
 
 * [Intro to Machine Learning](https://www.youtube.com/playlist?list=PL-Jc9J83PIiHioMKxmCxzpXdNfLE4TVjD) - Pepcoding (YouTube)