Semicolons are a useful way of joining together two independent clauses that are closely related (e.g., “Please take your shoes off; I’ve just mopped the floor”).
You can also use conjunctive adverbs to express the relationship between the clauses, which give insight into how your ideas are connected (e.g., “The experiment yielded unexpected results; moreover, it led to a reevaluation of our hypothesis”).
Semicolons add nuance and sophistication to your writing, but they should not be overused as this can make them less effective in helping information stand out.