Tech Demo Terrain Tile Script

I am looking at the tech demo (since I cant find a tut and everyone seems to be able to already make tilemaps) and was looking at the TerrainTile (working on a top down game) and noticed there is a script called TerrainTile but none of the objects in the scene have the script associated with them. Is this script generated from the sprite atlas or something? Also, anyone know of a beginners tutorial to get started with the tile map from scratch?

 

TerrainTile script is used by Pebbles and PBricks tile assets (the purple tiles). The script isn't showing up on inspector as being associated with these 2 tile assets because OnInspectorGUI was overridden in the TerrainTile script.

As for tutorial, I found this reference guide pretty helpful. Just be aware that it's slightly outdated now and some information are not 100% correct.

 

thanks!