Here is where you start to learn about texturing and shading. The bread and butter of these articles can be found in the beginners' guide. But for complete beginners, start by adding a texture to an object.
If you need something specific though, there are plenty of details uncovered in the other articles.
UV Mapping is the primary way to tell Blender how a texture should be mapped on an object. In this section we uncover all the secrets of this dark art.
UV mapping and unwrapping is an essential skill for any 3D artist. Start with the definitive guide.
For a robust alternative, check out box projection as well.
Baking is an essential part for game creation and we can leverage it in many ways to improve performance or create assets that isn't otherwise possible.