Ask HN: Any advice before starting my first real dev job?

Ive been independently coding webapps and teaching fullstack webdev for kind of a while but finally Im about to start my first fulltime dev job. Wondering if people have any one-line advice zingers.

So far my bff computer buddy said, pure functions, no variable mutations and no math in variable declarations. Those seemed like solid gold.

I want more please.

On second thought why would I not just ask chatGPT?