Learning to map is much more complicated than simply being taught everything from the start in a particular order.
I'd say the best way to learn is by making maps. Decide what you want to make, and read tutorials and get help from the community here in learning to do what's necessary for what you're making.
My first piece of advice is be careful what type of map you start out with. Some types of maps take a lot more work to do right than others. For example, don't start out with an RPG; if you want to make an RPG, I strongly advise learning how to use the editor by making other projects before you start the RPG, as an RPG takes a lot of skill, and undeniably more time and effort to do well, than other types of maps (be prepared to spend hundreds of hours just for an average RPG or thousands of hours for a good one).
My second piece of advice is don't take the lazy way out. While something may seem very difficult and time-consuming at first, it's worth learning to do it and doing it the right way instead of the easy way, because you will permanently benefit from this as you will be able to do this complex task much more quickly the next time you need to do something similar. It's also easier to learn the right way when you don't already know the lazy way, because the lazy way will always tempt you to use it instead if you already know it.
My third piece of advice is don't stare at your screen with the editor open! If you don't feel like doing one thing, then do something else; the moment you open your map you should be working on something. Whenever you get tired of working on one aspect of the map, start working on another part of it until you feel like going back; don't fall into the trap of staring at your screen aimlessly for half an hour trying to build up the courage to do something. Just do it, and you'll often be surprised at the progress you make.