How to improve sense of timing in motion graphics I would simply ask a way to get a better "sense of timing" in motion graphics... It's not about a software specific question: do you know a good online course that teaches motion graphics fundamentals, regardless you have to work with after effects or a 3d software?
You could begin by reading or watching videos about the "12 Principles of Animation", which are usually cited as a set of rules or building blocks for life-like animations and aren't in any way software-specific. Examples of videos can be found here, or here.