The left side of a pleasure craft looking forward (the bow)
The right side of a pleasure craft when looking forward.
A trick to remember which side port and starboard each refer to:
The common abbreviation P.S. (for English postscript, derived from Latin post scriptum) can be viewed as port ("left") and starboard ("right").
Port navigation light is red.
Starboard navigation light is green.
It is quite simple. There are four letters in the words PORT and LEFT so you can easily remember that the left side of a boat is the port side.