Contribute to project(s) that you use and write features that you miss (or fix existing bugs or improve documentation). Contributing to project(s) that you don

Contribute to project(s) that you use and write features that you miss (or fix existing bugs or improve documentation). Contributing to project(s) that you don't use is stupid and you'll be bored by it sooner than you realize... In the end you'll just waste a lot of time on something that won't be even committed.