How to make ART terrain??

Hi,i am new at terrain and i was wondering what is ART terrain and how can i make one?
What do i need to create a ART terrain....
PLEASE HELP ME
---------------------------------------------------
I want to create ART terrain
+REP to everyone who helps me or shows me a tutorial...

SAY ANYTHING THAT I DID WRONG ON THIS THREAD

P.S PLEASE REPLY

firstly is UTM needed for quality doodads and such. (Ultimate Terraining Map)
secondly a good knowledge of what looks good.
thirdly time to try stuff and look how it is looking.

Thats all, and of course the World Editor.

It takes time to learn it. More or less.

crl, that is reported. linking your own thread to get attention.