Every state has different possibilities. Real estate course required by the state, traffic school, driver ed, etc. Look at each state DMV licensing website and look for "course providers" and you can make a course and get onto the State list. All you have to do is get it approved and do any sort of yearly re-approval and you good. People go to the list, pick a course, you provide some sort of certificate (I make a PDF) or submit back to the state with an api. Once your approved it is easy from then on out.