Guys. I used to play QB and I was taught at pre-snap to read the defense. Make sure the alignment is correct. Feel pressure and know blitz. Progressions are as followed: If I had 4 WRs (2 L and 2 R) (No TE) (1 HB). Since I am Left handed, I am already looking right, I would start by looking off the safety if no one is open right look quick left 1 , 2 , 3, 4. Progression are always will always be: Deep, Intermediate, Shallow, and Short, Hot Read is the BACK out of the Backfield. So WR1 is Right far, WR2 Right slot, WR3 LS, WR4 LF. In today's NFL it is different as plays are called to one player only if he's not open then 2 if he's not open 3 and excreta. It all depends, some QB's have it out in 3 seconds or less and some can move around and keep it 5 or more seconds. RT is a lock-in QB wants to throw to first read which sometimes takes too long. It appears he wants them completely free of a defender before making a throw. In these examples which is not good.