Which node to use?

There are quite a lot of nodes. Is there some overview with usage examples? Where you can see what you would typically use that node for in a game?

I have seen KinematicBody2D used for an NPC, but the docs say "meant to be user-controlled", which confuses me a bit. Mostly because the tutorial material did not explicitly said why this node has been used over any other.

Is there also some best practice in terms of "you should use the most general node, unless you really need the functionality of more specialised one" or something like that, or does it not matter?