Please mod parent up.
Orbiter is awesome for really understanding orbital dynamics. It is one thing to know about the theory, but it is something else entirely to actually put it in practice and feel how complex it can be. Once when flying the Shuttle and trying to rendez-vous with the Space Station, I was falling a bit behind, so I instinctively pointed the ship towards the station and fired up the thrusters a bit in order to catch up. That should get me back closer to the station, right? Well no: given our direction of travel, that burst of thrusters just raised my orbit, hence making me slower, so I fell behind even more and ended up totally screwing up that rendez-vous.
So in space, you don't just go eyeballing your flight like you would in VFR on Earth. You really do need a flight computer, and a lot of planning ahead of time. Try it out, it really is eye opening. Then, once you really get orbital dynamics, you can start imagining what space combat would be like (spoiler: as many have already said: slow and boring. Sorry, no Star Wars style space dogfight...).