What is in your global rules?

Curious what everyone puts in their personal (global) rules. Mine:

• Prefer small functions and early returns.

• Never add a dependency without asking.

• When unsure, ask one question instead of guessing.

"Explain the change in one sentence before making it." Keeps it honest.

"Use type hints everywhere" and "no print debugging left behind".

"Write the test first, then the code." It follows this surprisingly well.