How do i add my own custom textures to maps?
Im working on an island and I plan on making new textures.

You can make custom textures by putting a new texture folder in the textures directory. For example: textures/new_texture_foldername . Put the new textures in that new folder. Make sure the dimensions of pixels in the image are of powers of two (like 128 x 128, 256 x 256, and so on.) Texture artists online take note of this rule, so often they make textures and shaders that follow this.

When you need to export your map, remember to put these new textures in with the .pk3 file. If you need to play MP to test your level (that isn't in a .pk3 yet) use the console command sv_pure 0.

Thanks alot again echoman