This is a pretty good guide to getting started on contributing to Chromium. I was an external contributor for Chromium for 2 years and it took me a while to fi

This is a pretty good guide to getting started on contributing to Chromium. I was an external contributor for Chromium for 2 years and it took me a while to figure out some of the procedures and best practices, like building the Release build instead of Debug or changing my GYP defines to using SHARED_LIBRARY -- those tweaks will literally save double digit minutes even on machines with very beefy CPUs. The only other thing I can think of that I would add to this guide would be to search for "Hotlist:GoodFirstBug" in the issue tracker when trying to get started. Not every bug there is actually easy for a first-timer on the project to tackle, but you can normally find something to dive into and try to fix, even without much knowledge of the codebase. I overall had a great experience with the project and it really helped me grow as a stronger developer early in my career.