my github page doesn't work code example

Example 1: my html doesn't show up github pages

Cause 1: make sure you have an index.html file

Cause 2: make sure that in GitHub Pages (under settings) your source is the
master branch

For anything else look here: https://stackoverflow.com/questions/45362628/github-pages-site-not-detecting-index-html#:~:text=Go%20to%20settings%20for%20your,the%20gh%2Dpages%20branch'.

Example 2: my github page doesn't work

The preferred files to be served are index.html, index.md, and README.md, 
in that order. If none of these files exist, your website will show a 404 
Not Found error, even if there are other HTML files in the repository.