How to download minecraft user created maps like a dungeon escape or a maze or something like that?

You must first download the file then unzip and take out what you think is the world (should be pretty obvious) then you open then to get into the saves folder, you
1. Open the launcher
2. Click edit profile
3. Click open game dir
now you should be open to the.minecraft folder. Notice its location for future reference. Then you drag the world folder into the saves, and any reource packs into the resource packs folder. And you are done