[thiago_fm]

Take a look at the completed merge requests/features. If any developer of that team was any good, there would be plenty of well-written merge requests and commits.

With that, you would know what to touch and when.

When in doubt, check tests, the feature itself and the git history.

If you are new to ReactJS, also try to look for a mentor inside your company/team. They don't need to to active mentoring, but more like a person you can fall back to, and that enjoys doing mentoring and does it well.

BTW, Good luck on your new job!