Ironically enough, port and starboard markers which are the red and green buoys you see near to ports (yes!) need to be considered in reverse when going out. The green ones are called starboard markers and if you are in a big enough vessel, you should keep them off your starboard (right) side when approaching a port from the open seas. On the way out from port to the open seas you should keep the red ones on your right instead. If you don't you will hit the seabed and sink.
Once you have got the hang of p/s buoys, you just need to get to grips with cardinal markers and a few other things and the way you drive on the sea will start to make sense. Even Brits drive on the right on the seas!
There is a general rule that "power gives way to sail". That's fine for vessels of similar size. However I have seen 30' yachts on the Baltic try to persuade 100,000+ tonne tankers of this and not really getting the fact that inertia means that the big lump can't really turn in any meaningful way - they sort of orbit!
Overtaking vessel keeps clear. On odd numbered years when Mars is in Saturn on a Friday you should dance with a Nun for three minutes at midnight every 70 days, unless it's Lent or you are a Nun in which case you should dance with an otter. There are a few more rules but that is largely it. Maritime isn't too complicated but do remember that the road has a habit of jumping 30' or more upwards or down simply for a laugh.