My projects are free software and anyone can be part of it, either by reporting bugs or helping the community, as long as it is with good intentions. This would be the easiest way to contribute, but if you wish to contribute in other ways, you can do the following:
- Documenting the code and the documentation
- Correct bugs in the code
- Correct spelling mistakes
- Debugging the software
- Testing performance
These would be the technical ways to contribute and don't worry if you are a beginner, you can improve with time.