Your state will likely require you to take THEIR class as far as concealed carry is concerned.
The very fact that you even have to ask this question is evidence you're woefully unprepared to start down this road.
Some states do, some states don't.
Illinois, for instance, accepts NRA pistol certs as a qualification. Others do as well. In Illinois, you fill out a form and an affidavit, attach your NRA cert and submit and submit prints. Only other thing is required is approval of your course curriculum. If you're using an already approved curriculum like the one sold by the group Illinois Carry, you list it. The state then sends you two approval letters, one with your instructor number and one with with your curriculum approval number.
Utah, OTH, takes a recognized instructor cert (NRA being one of them) plus a half-day class taught by troopers from their Bureau of Criminal Identification. They actually send you an ID, and you also have to buy a certain ink stamp with your individual instructor number on it.
It varies.