So... "map" is short for "bitmap" or "texture". Your model is using a diffuse texture. There are a number of different texture maps game models can use. What textures are used is entirely dependent on your viewer's or engine's render pipeline or shader network. Like artistic technique, the technical side of game art…
You're doing good. By rendering your forms such that material types are clearly defined and use the same light sources, these aspects can be isolated nondestructively and built upon or refined later. Next, you can introduce full-form highlights and shading to unify materials and small details into a singular form. Done…