To these fine tips I would add: ‘test on as many devices as you are reasonably able’. Something can look fine on your laptop but lousy on the platform for which you are aiming to disseminate.

> "[...] I would add: ‘test on as many devices as you are reasonably able’."

Testing on a reasonable amount of different screens (and software-based filters etc.) is excellent advice for too many people forget this. Of course that's also always a money, time or motivation (goal) question...

This also applies to webdev. I develop a lot with the chrome devtools but once stuff is in mobile it doesn't quite work out due to people using different browsers. The browser bar sometimes being on top or on the bottom hiding controls... I started to just center stuff in mobile ignoring like 20% of space in top and the bottom.