Consume fewer calories than you use for an extended period of time. Everything else is optional and entirely dependent upon what you can enjoy or tolerate doing. This sh#t's real simple, keep it that way. A lot of people make a lot of money making it seem much more complicated than it is.
It's not entirely that simple, there are plenty of little nuances. Plateaus and how you overcome them, eating enough so you don't screw up your metabolism and general health, and of course the hardest part which is the mental side of things.
It's entirely that simple. If you're eating less than you use it's basically impossible to plateau.
That's usually a matter of people thinking they still use as many calories as they did when they were, say, 30 lbs heavier, for instance. Adjust accordingly and it shouldn't be a problem.