A collection of links and archived texturing methods from years past. If you want to match the old style of 1998~2005 texturing this is your resource list.
FUNC_VEHICLE IS THE BEST ENTITY. FUNC_VEHICLE FUNC_VEHICLE FUNC_VEHICLE
SOURCE ENGINE TUTORIALS & RESOURCES:
(I am no longer working with Source engine and these were written pre-steampipe update. These should be viewed as legacy tutorials as info may be out of date)
Ever wanted to use custom particle effects in your maps? This 2 part Video shows how to compile your own "Spritesheet" VTF and make it into a working particle system.