Added new advanced course for Next.js (#9749)

* Added new advanced course for Next.js

* (Changes made) Added new advanced course for Next.js #9749

* (changes made)Update free-courses-en.md

Removed redundant link, which got miss copied

* Update courses/free-courses-en.md

Co-authored-by: Eric Hellman <eric@hellman.net>

* (changes made)Update free-courses-en.md

---------

Co-authored-by: Eric Hellman <eric@hellman.net>

courses/free-courses-en.md

@@ -965,6 +965,7 @@
 * [Mastering Next.js](https://masteringnextjs.com)
 * [Next.js for Beginners - Full Course](https://www.youtube.com/watch?v=1WmNXEVia8I) - Kapehe (FreeCodeCamp)
 * [Next.js Tutorial for Beginners](https://youtube.com/playlist?list=PLC3y8-rFHvwgC9mj0qv972IO5DmD-H0ZH) - Codevolution
+* [Next.js Tutorials for Beginners](https://youtube.com/playlist?list=PL0Zuz27SZ-6Pk-QJIdGd1tGZEzy9RTgtj) - Dave Gray
 
 
 #### NodeJS