How to color objects faster?

Does anyone know any shortcuts that I can use to color a whole room for example, instead of applying the material to each of the tiles? ,Does anyone know any shortcuts that I could use to color; example a whole room? Instead of dragging the material color to each of the tiles in the room?

Just select every object you want to change the material of. Note that it only works if the material slots have the same layout (i.e. you want first material slot of object A to have the same material on first slot of object B). This is true, not only for materials. Unity actually supports multiple objects editing for almost every existing component.