What to do if the site does not work, error 404 (github)?

Question

GitHub

Today I watched a lesson on the Internet that with the help of "GitHub" you can upload a site to the Internet.
Registered on "GitHub", downloaded Github Desktop, configured everything there (repository),
but this site gives error 404,
although I think I did everything right

here are the screenshots

Answer 1

start little by little
0) clone someone's rap