Which way do I turn the crown to wind the watch?

Almost all mechanical watches wind by turning the crown clockwise (if you are looking straight at the logo on the crown). When you are looking at the face of the watch, this means rotating the upper face of the crown upwards, toward the 12.

Most watches are perfectly accommodating in allowing you to turn the crown the other direction too, but this is simply a neutral gear mode which does not wind the watch. Some people prefer to turn the crown back-and-forth without taking their fingers off of it. Other people rotate it forward, reposition their fingers, then rotate forward again. Both are equally valid and effective ways of winding a watch.