I saw a training video about that, that’s how I know.

I stand corrected.

Port is fine stuff!

No it is not. Port and starboard are only left and right if you are facing the bow. If you are facing the stern they are reversed (from your perspective). The reason why is to make sure there are unambiguous terms for turning a ship in order to navigate and avoid collisions.

Btw the same rule applies to airplanes. If you are flying and have another airplane flying towards you both pilots must turn starboard to avoid a crash.