Add a more comprehensive Git tutorial for beginners

Author: robertlyall

README.md

@@ -164,7 +164,7 @@ But knowing the stuff will help you become better! :muscle:*
 - :hammer: [CV Compiler](https://cvcompiler.com/)
 
 ### Open Source
-- :globe_with_meridians: [An Intro to Git and GitHub for Beginners](https://product.hubspot.com/blog/git-and-github-tutorial-for-beginners)
+- :globe_with_meridians: [Learn how to use Git and GitHub](https://www.deployhq.com/git)
 
 ### Remote Work
 - :globe_with_meridians: [Remotive.io: Startups hiring remotely](https://docs.google.com/spreadsheets/d/1TLJSlNxCbwRNxy14Toe1PYwbCTY7h0CNHeer9J0VRzE/htmlview?sle=true#gid=1279011369)