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You will be taught how to use the entity; "Func_Door_Rotating". Pretty easy :)
The Skybox is the Image around your map - This tutorial is 100% Necessary if you are making an outdoor map.
These are the standard Measurements, taken from cs_mansion which is practically older than CS. It includes; doors, walls and windows. - Very basic Mapping...
In this tutorial, you will be taught how to clip objects, using the Clipping tool.
In this tutorial, you will be taught how to make the blue areas on textures e.g. fences, air-ducts and so on, and so fourth, invisible.