Find an area you can help with and do it. Open source is about collaboration and open participation. Try to make your code look like what already exists and submit a pull request.
The list of issues is a good place to start, especially the ones tagged as "help wanted" (but don't let that stop you from looking at others). If you're looking for additional ideas, the code includes TODO comments for minor to major improvements. Grep is your friend.
Additional tests are rewarded with an immense amount of positive karma.
More documentation or updates/fixes to existing documentation are also very welcome. However, if submitting a PR consisting of documentation changes only, please try to ensure that the change is significantly more substantial than one or two lines. For example, working through an install document and making changes and updates throughout as you find issues is worth a PR. For typos and other small changes, either contact one of the developers, or if you think it's a significant enough error to cause problems for other users, please feel free to open an issue.
Find us:
- Chat: Gitter.
- Mailing list: join the ~MimbleWimble team and subscribe on Launchpad.
For info on the Grin style guide, see the style docs.
Grin leverages rustfmt to maintain consistent formatting (and a git commit hook to run it).