Write things down. It seems like a stupid chore, tedious, boring, and archaic, but it's the way organizations remember.

I want to add: write things down in a place where everybody can access. For example, make a habit to write issues in GitHub when decisions are made.

Simple, obvious code is easier to write, easier to get to work, easier to understand, and easier to change without breaking it.

Sometimes the simplest code is not immediately obvious. There are often cases where you start to work on what you think is the simple solution, but it turns out it’s more complicated than you initially estimated. At this point, you should know when to take a step back, and try to find alternatives. You might have overlooked a better solution first time around.

I’ve seen this in action too many times in both myself and coworkers. In the worst case a coworker spent many weeks on trying to get a solution to work, when a simple 15 minute solution was available all the time.