There are millions of open-source projects you can contribute in GitHub,

Checkout for the tags like,

🔖 good-first-issue: Which means the fix is beginner friendly

🔖 hacktoberfest: All the projects/issues accepted for hacktoberfest most of them are quite easy to work with

🔖 documentation: open-source is not only about code even documentation counts

If you are confused about an issue, you can ask about it in the issue comments, most maintainers are more than ready to help you.