On your computer, create a file in your repository called index.md. index is always the entry point to any website - the “Default” webpage.
Add some content - perhaps this could be your to-do list or a “Welcome to my homepage” page if you like. Save it and commit it to your repository, then push to GitHub.
Now you need to enable GitHub Pages in order to see it turn into a live website.
On your GitHub repository, go to the settings (top rightish tab with a cog icon).
Scroll down to the GitHub pages section. Under Source, select master branch or main branch and press save.
You can also select a theme if you like!
Once this is done, you should see a green message saying “Your site is published at some-link.github.io". Click on it - and ta-da! You have a website.