Football positions - who plays how/where/what?

Here is a small attempt to explain the different positions in football quickly and easily:

What are the positions in American Football?

The Offense:

Quarterback (QB):

The player who mostly throws the ball to his teammates. After the "snap", he gets the ball first from the center and can then either throw the ball (pass) or pass it on to a running back, or run with it himself. He is seen as the "head of the offense" and has a lot of interaction with the offensive coaches on the sideline, determining the plays with them.

Running Back (RB):

The running back usually gets the ball from the QB and is then allowed to run in the direction of the opposing defense to gain yards aka space.

Wide Receiver (WR):

This text will be continuously updated...