I learnt a painful lesson fairly early on in my career and it was not to assume that people (peers, colleagues, team members) are on the same page as you and have the same information and knowledge you do. As one manager said to me to assume can make an ass out of you and me!
This is especially important when discussing things with your team. Just because you have the knowledge about a process or policy don’t assume that everyone else does. Think about when you got that knowledge, how far along your career path were you?
Since that fateful day I’ve always tried to follow the advice of my manager. Assume nothing and state everything. It can really help ensure everyone is on the same page.