What version of noggit are you using?
There is plenty of tools that do different things. i would highly suggest you use a github version which is updated to the latest which offers far more advanced tools of what you currently can find on the forums.
As for textures you can only have 4 max a red square of a ADT(Tile), theres 256 Squares a ADT(Tile) and there are 4096 hole squares. - No idea what else to call them.
1: Raise/Lower, Increase or Decrease the altitude of the terrain etc.
2: Flatten/Blur, Smoothing the terrain out.
3: 3D Paint (Painting textures)
4: Holes, you open up small squares that can be seen by pressing F7 and then "View" > "Hole Lines always on" often used for caves and basements etc.
5: Area paint, which lets you add Area types that are defined in Areatable.dbc
6: Impassible flag, Makes it impossible for users to bypass the selected area.
7: Water Edit, Lets you add and take away/change the color opacity of water.
8: Light edits, Currently non functional.
9: Shader editor, color different areas with shading.
0: Object editor, Lets you place, add & copy objects and edit them.
