GitHub is a git repository service.
You may stumble into github projects when searching for solutions. It's a place where people can share their work and collaborate with others.
Searching for code on github can turn up a lot of results that may be hard for a beginner to evaluate. We are more likely to stick to popular libraries and things recommended by experienced developers.
GitHub Pages
Create a free developer profile.
https://pages.github.com/themes/
https://docs.github.com/en/pages
Deploy a static site
Add index.html to the root, or in /docs.
GitHub Actions
Continuous integration.
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