So many! Some initial ones, that aren’t dedicated play/scheme related (which I’ll be sure to post in the relevant threads):-
What is the benefit of using a time out, especially when close to the end of a quarter?
What is the difference between a fullback/halfback/scatback?
What is the benefit of the QB being under centre vs being slightly back (shotgun?)? Is it to run set plays only?
Thanks
Timeouts are sometimes used when the play clock is almost expired. Its a mistake to use a timeout, but saves the offense a 5 yard penalty. Brady uses timeouts occasionally to get the defense to reveal its formation and then go to the sideline to discuss play options. Weather can be a factor using time outs like strong wind. You obliviously want the wind to your back on offense. A defense could call a timeout on a crucial play to keep the other team driving against the wind. The offense could call a timeout so if they need a field goal the wind is in their favor.
For the most part you try to keep all 3 timeouts for the end of each half. Although, the 2 minute warning is essentially a 4th timeout so if you do have to use 1 timeout unexpectedly its not that crucial.
Fullback is basically a blocker. Devlin is the NE Fullback. Sometimes they run the ball and act as a receiver, but its rare. Not every team carries a Fullback on the roster some seasons.
Halfback is primarily a rusher although some are dual threat receiving as well. Lewis, White and Burkhead are in the dual threat category. I dont think that Gillislie is though, but he is still a Halfback. Bolden is a poor mans dual threat Halfback.
Scatback is sort of a nickname for a small shifty running back. He could still be a Halfback. Barry Sanders reminds me of a Scatback running around like a pin ball all over the field.
QB under center means a run or pass can be called. A QB sneak as well. The QB has to take steps back to pass which can take longer to set up to pass. The shotgun is more often than not a pass, though you can still run from the shotgun. Halfback draws are a popular play to run from the shotgun.