What’s the last mistake you made in professional setting?

This was some time back. I was talking to another teammate when the client was on call and I was sharing my screen. I was telling the teammate how the client just won't understand lol. Yes I wrote lol. He was very nice though. He just said you are sharing your screen. But nothing else.

Befriending my boss. Things went sour, and I had no choice but to leave. Learnt from my mistakes, and now I’m fine keeping my coworkers at an arms length.

Not documenting items discussed in meetings with emails / slack messages. 3-4 weeks later, colleagues said “We were not told X item is to be done as well. This is new item and we can’t do it.” Looked bad in front of my boss. Learnt my lesson :) A Product Manager has to be good at Project Management too! Be paranoid and over communicate.