Starboard & Port - Sidelights - Buoys

Port side

The left side of a pleasure craft looking forward (the bow)

Starboard side

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").

What color is the port side light on a boat?

Port navigation light is red.

What color is the starboard side light on a boat?

Starboard navigation light is green.

Another trick to remember it:

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.