Here's how we can figure out its meaning:
* "Bring a parasol..." This suggests that a "parasol" is something you bring with you.
* "...beach because sun is hot!?" This tells us the "parasol" is used at the beach and is related to the sun being hot.
Putting these clues together, we can infer that a parasol is likely a type of umbrella or shade-providing device used to protect from the sun at the beach.