Imagine you're standing on a boat, facing the front (or bow, for all you sailors out there). The Port Side is the left side, and the Starboard Side is the right side. Easy peasy, right? But, here's a fun fact: the words "port" and "starboard" come from old sailing terms, with "port" referring to the side where you'd port your ship (or load and unload cargo), and "starboard" coming from the steering board side (where the navigator would stand).
Now, you might be wondering why we don't just use left and right like we do on land. Well, it's because when you're on a boat, your left and right can get all mixed up (especially if you're sailing in circles!). Using Starboard and Port Side helps sailors stay on the same page, even when the seas get rough.
Port and Starboard: Useful Difference between Port vs. Starboard • 7ESL