I am compiling a rules of programming mindset for my team: What are yours?

KISS - Keep it simple, stupid.
Pick the simplest solution that works.
Don't make things (too) complicated before they need to be.
Just because everyone else is using some complicated framework to solve their problem, doesn't mean you have to.

Always leave the code a little better than when you found it.

Don't be afraid to admit "I don't know" and ask.