how to use gitHub?

Hello GitHub users and expertises I am new to using GitHub I regestered my account early 2019 and I am not have any experiance for What we use GitHub, and what is the benifit of using GitHub.?

Please see my reply to this other thread:

https://github.community/t5/How-to-use-Git-and-GitHub/New-to-github-watched-some-youtube-videos-but-no-success/m-p/24517#M7032