It all depends no what you are shooting. You can find many websites that discuss chokes and the applications of which is best for what type of shooting you are doing.
It is very recreational and great activity where participants using shotgun shooting chokes. It is one of the three major disciplines of clay pigeon shooting, sporting clays and trap shooting. There are many types of skeet which include Olympic skeet or international skeet. It is designed to be a 30-inch circle at 21 yards distance.
Full and modified.
The best shotgun shell for shooting ducks is a 3 to 3 1/2 inch 12 gauge with number 2 shot.
Use helium balloons, let them go and shoot them with you chosen gun.
That will depend on what you are hunting, what gauge you are using and what load you are shooting. As a very general rule, modified and improved.
Usually modified, but each shotgun may be a bit different.
I would use either a modified,or improved cylinder,choke for close in small bird hunting.
Either a full choke,or extra full choke shotgun barrel.
either a heavy 6 or any turkey load if your close i would use #2 if your shooting farther
Best guess: You have a shotgun manufactured in Croatia. "Pun" means "Full" in Croatian. "Pola" means "Half". You would have something like 70% constriction in the Pun barrel and 55 to 60% constriction in the Pola barrel.