Learn the basics first. You can use one of these resources:

• https://www.w3schools.com/git/default.asp
• https://www.youtube.com/watch?v=8JJ101D3knE
• https://www.youtube.com/watch?v=tRZGeaHPoaw

Or any other resources you find and like.

Git and Github keep changing things as they are continuously developed. If something doesn’t look exactly the same way in the tutorial as it does on your computer,

• check the comments under the video to spot whether anyone has had the same problem and how they solved it.
• If that doesn’t help google for a solution.
• If that doesn’t yield any results, ask for help in the git discord channel.