help Don't understand Map Editor

[Emery Thrash 31]

I already looked at all the tutorials and all the topics Lukas made to help with explaining the Map Editor, and watched all the videos I could find, but nothing works.

What I want is someone to make a video or doc file explaining in full and as much detail as possible to how the Map Editor works, and how to edit the exiting vanilla map, as well as to how to create, from scratch, an entirely new map.

A tutorial that will leave the least amount of questions as possible.

I already have the Map Editor. Where do I go from here?