I would watch the videos on you tube on this, I think there are loads.
Out in the field it is only when you walk into a comms room that hasn't been touched in 10 - 15 years, that any of this actually matters (and see a heap of late 90's devices on hubs) .
Broadcast domains are far more important in the real world, getting your head around the fact that a gateway may be 2 switches away etc. It is this kind of thinking / learning that is required to draw decent network diagrams. Average network engineers mix physical and logical diagrams, you should always draw both - no matter how simple the network is.