How do I match technical explanations to my audience?

You can explain technical things, and you have noticed the finer challenge: the right depth changes with who is listening, and you do not always read that well. This unevenness is normal. Judging what another person already knows is genuinely hard, because you cannot see inside their head. The usual mistake is deciding the depth before you know your listener. You prepare an explanation and deliver it whether it fits or not. But good communication is not a speech you give; it is a thing you adjust in real time based on what the other person shows you. Before your next explanation, ask one question first: what does this person already know about the topic. Let their answer set your starting depth. Then watch their face and check in as you go. Matching the listener is less about preparation and more about paying attention while you speak. Slow down enough to actually see them.