The very, very basics you will have to learn are the basics of moving around the dungeons. The main object of the mission is pointless if you will not be able to reach it.
Despite all of the threats, moving isn't really that hard in the DD. Entire games is 2D, thus your team can move either left or right (A/D buttons and LPM). This is it for a single sections as the rooms. These however, are connected with each other with corridors. In order to reach another room you will have to go through the entire corridor which may be guarded by some randomly generated enemies or traps. Choose the room to which you want to move by clicking it on the minimap in the bottom right corner of the screen.
It is worth mentioning that once visited, the corridors and rooms don't change. Thus, there won't be no new enemies, traps, objects etc.
While traversing through a dungeon, you will have a small chance to get into secret rooms - those are marked with a special, golden star on the map and the entrance to such a room is always located inside the corridor (and not in the room). The only way to reveal a secret room is to locate it through Scouting. You will always find a container inside, which should be opened with the Skeleton Key, in order to get the goods inside.