Remember:
There is no RED PORT wine LEFT in the hold.
The port-side is also defined by the fact that ships earlier in our history used to turn with a big oar hanging off the right side being used as a rudder - a steering board. Starboard. And it was easier to pull up to a dock with it on the opposite side from that bit jutting out.
Nowadays, I never forget that starboard is on the right because that's where the steering board used to hang, and therefore you'd usually moor to the port on the left side.