Tip: Use “to know” instead of “know” after “it’s cool”, and say “learning languages” instead of “important learn languages”, since gerunds (learning) work better as subjects in this case.

Well-written! I also agree that knowing more than one language is so cool. Good luck with your studies 😊 ＞ “Crucial” and “Important” generally means the same thing. However, crucial is more formal and has a stronger nuance to it.