Setup the same linter, IDE, and code auto-formatter. This way, there's no need to argue about silly things and the whole team can focus on what matters - the actual code. Refer to my coding setup for details.

Agree on a workflow if you can. I typically follow the feature branch workflow. The article does a good job explaining the idea, but the tl;dr is to work on a separate branch for each new feature and not directly on master so you're not disturbing everyone else's work by pushing.