Real estate investing is a numbers game. You gotta know your numbers.
New house in your area sells for (say) 80,000.
*how can you buy it for cheaper than that? Maybe, build them yourself. Rehabbing is a standard method. Buying forclosures ditto. Getting financing that is really cheap is another good way. ANYTHING you can think of.
*how can you sell it for more than that? Find people who will pay extra - maybe people relocating into the area who can't check the place out for themselves, or maybe you know that the area is a particularly great one because it's exactly midway between two malls, or whatever. Maybe the area has low taxes because the schools are lousy. Lots of times people bet that house prices are going up. Find SOMETHING to sell that house for more than you paid.
*creative financing! Because of the tax advantages of owning a home, and the tax situation of owning a business, and all sorts of intricate things that accountants know how to do, you can sometimes find an edge that way. For example, my sister the bookstore owner bought the building that her store is in, using the equity in her house as payment/collateral, and somehow the building is now many years later making her more profit than her bookstore is.
Them's the basics. All the courses and stuff you take is just ways to find an edge. Motivated sellers MIGHT sell for less. Buyers with bad credit MIGHT buy for more. Etc.
Good luck.