This is the very first thread and post to the Tutorials Section. Here you will learn to build turfs for when you are mapping.
turf/Basic_Turfs
This sets the directory of the file to Basic Turfs. The Underscore ('_') is used as a space.
turf/Basic_Turfs//Previous Code
icon='Turfs.dmi'
When you open up an Icon File there is a name for it. You select the name and it is called a DMI file. Make sure to put ' ' around it instead of " " this will cause bugs.
Floor is the Name of the Icon Directory for you, and you only when you are Mapping. icon_state is the the name you have given your picture. Everything is CASE SENSITIVE!