Question for all: what are some of the unspoken rules you wish you knew about the workplace?

I read The Unspoken Rules by Gorick Ng ( recently. Many of the points I was like -facepalm- "that is so true". I wish I had known them earlier on in my career.

I'll post a few in the comments. Reddit has a subreddit called Life Pro Tips (LPT). I'd love to hear your Work Pro Tps (WPT). šŸ‘‡