The goal is also to contribute to a project that you'd be proud contributing to. For example, my cousin's Twitter clone is easy to contribute to, but it has no effect on your resume.

Not exactly a beginner friendly OSS project. Pretty rigorous contribution guidelines (for good reason... but probably not a great first project for beginners).

haha, that was the first thing I said. Obviously not a curated list because anything AWS maintained is not a good place to start your OSS journey