How to snap the center of a face to another face? I have a sword handle and I want it centered below a completely differently object that has a face on the bottom with a vertex in the middle. I could also snap a central vertex to the other one but I don't know how. How can i do this?
You can use Vertex Snapping.



You can enable it by clicking on the magnet icon or If you wan't to use it temporarily, hold down Ctrl.

I would recommend setting the second option to active:



You use it by moving your object in edit mode Tab: