For past English-ers, did you use colons and semi colons in your essay?
I used them, but not *super* regularly, compared to commas and em dashes (linguists please correct me if this isn't the correct term). I particularly loved (and doubtlessly overused) em dashes because they're pretty versatile.
Use a semicolon when you want to mark a break that's stronger than a comma, but not as strong or final as a full stop. A semicolon is there when you want to join clauses that could stand by themselves as sentences but you want to show the connection between the clauses.
You can use colons to introduce lists, to emphasise stuff, and to separate two clauses when the second one is like, following on from the first clause, or if it explains the first clause.
My advice would be: use them if you're comfortable and confident to use them, but otherwise, maybe steer clear - the assessors reading your essays won't mark you down for not using them (provided your piece is otherwise grammatically correct), but, if you use them incorrectly, that's gonna cost you marks.
If you want to incorporate them into your work - I'd recommend reading a bit about them (there's heaps of websites that provide pretty good explanations of grammatical stuff without using too much jargon), and then just practicing working them bit by bit into your writing.