Watch/read these links in order and practice in your personal git repository at the same time. You should memorize the basic git commands and their usage.

• Git tutorial by Sajib

Pro Git is the best book on Git. It is written by one of the cofounders of GitHub. Read ch 2 and 3 to get started. I recommend reading the whole book if you are interested.

• https://learngitbranching.js.org/

• https://try.github.io/levels/1/challenges/1
• Git Tutorial for Beginners: Command-Line Fundamentals
• Git Tutorial: Fixing Common Mistakes and Undoing Bad Commits
• Git Tutorial: Using the Stash Command