Novel

[jens]

But let's say you (normal user) are making a map in game, do you need to know basics of coding or is it as easy as map editor, let's say, in Age of Empires, etc.?

To make a map, that has items to pick up, things to interact with(doors that can be opened etc) does not require any coding. But if you want to add functionality, say have a key that can be picked up and used to open a door you will have to do some coding. But it is very basic and fairly easy, its not the difficulty that will be what limits the user, it will be making the effort to do it

using a key on a locked door to open it would be something like:
useitem("key", "door", "opendoor");
opendoor() setentityopen("door", true);

edit
thomas beat me to it..