YBCA

First, on the give-and-go, one problem is always the timing between the player cutting immediately and the receiver catching, pivoting, looking and making the pass. I like the immediate cut from the passer, and we practice a quick catch and pivot to the basket. One thing to emphasize is that not every cut, screen or move has to result in a shot or pass; a second part of that is that if a player was open on the cut, and the passer is not ready, it's better to miss the open player than to force the pass late. Depending on the location of backdoor passes, we would put general guidelines so that the players know when a pass is too late.

So, to answer the question specifically, it depends. If you're trying to get a give and go on the right side, you don't want the others cutting into the space. I basically give the right of way to the closest person – that is, if a player on the left wing starts to cut into the space and the player makes the give and go cut, the player from the left wing should break off his cut because the give and go cutter is in front of him where he can see him. He should probably fill the space vacated by the give and go cut. If they make a mistake, then the passer should hold the ball rather than passing into the congestion and wait for the next cut, screen, etc.

The posts need to look for space and look for angles. So, my rule is that if a ball handler gets stopped or trapped, the other players are responsible for creating the passing lane. If a post stays behind a defender, it's his fault the pass gets stolen or he does not get the ball. He needs to move into a gap and get the defender's hands out of the passing lane. Sometimes that means sliding along the baseline or sliding up the lane-line or circling under the rim, depending on the angle of the drive and the defense. If players want to score, especially post players, they need to be adept at finding these angles and creating these passing lanes. It's not one specific thing, but an emphasis on the player playing in a stance and constantly shifting into positions to receive passes. We did this with 2v1 and 2v2 drills with penetration from the top and a receiver waiting on the block, and the drills work as finishing drills too. Memphis coach Josh Pastner told me posts need to move like boxers with small shuffles, always on balance rather than big steps. that's a good way to think about it. 

1) Yes you can. However, the passer has to read the next defender before throwing a pass, as it's often not there.

2) They can either cut opposite or they can cut and replace to maintain balance. Or, you can run more of a 4-1 and have the post fill behind the cutter or step out to receive a pass. You also could use the cutter to set a screen to bring the post toward the ball. Lots of options.