I also started contributing to OSS past year only, you can first start off by correcting the documentation of the project, because many of big OSS projects do not have correct documentation or it may also contain typos, and after that you can start contributing to projects by building them and spotting bugs and errors, and if you know python well, than you can help the python community, by building python from source and testing it and providing your feedback, here is the source code of python github.com/python/cpython and they have a well documented build instructions in README. Other option is you can contributing to React js' source code
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I also started contributing to OSS past year only, you can first start off by correcting the documentation of the project, because many of big OSS projects do not have correct documentation or it may also contain typos, and after that you can start contributing to projects by building them and spotting bugs and errors, and if you know python well, than you can help the python community, by building python from source and testing it and providing your feedback, here is the source code of python github.com/python/cpython and they have a well documented build instructions in README. Other option is you can contributing to React js' source code