Port/Left is what I used to use to remember until I heard this story. The really old boats used to have a rudder (or oar) was hanging off the side of the boat for steering. So it was originally called Steerboard since that was the side for steering. Which is maybe why the steering wheel is on that side now. Since the rudder/oar was on that side, you couldn't get out of the boat on that side, so you had to get out on the other side, the port side. Port is defined as an access point. You'll see that word used in computers, bays, windows in a boat, etc, so the access point to the boat would be the port side in those old boats. It would be a lot easier if they had left the name Steerboard.