Playing stupid.
I used to (was raised to) think that I had to have all the answers, all the time. When I started working my reviews frequently mentioned "time management" as an area I needed to improve in because I was so busy giving other people the answers they needed (sometimes to simple questions) that I neglected my own work. A senior coworker told me one day, "it's not your job to have all the answers. You only need to have the answers *you* need to get *your* work done. It's okay to play stupid, don't do their work for them.".