For the love of all that’s holy, if you aren’t sure know how to use a semicolon, please don’t. Yes, semicolons are sexy (at least I think they are). Yes, semicolons are exotic (in my world, at least). Yes, semicolons are sophisticated (of course they are!). However, semicolons are NOT for the faint of heart.
To avoid making yourself look like a rank amateur, do your homework on the semicolon. Research it, learn about its usage and practice using them. Only after you have a working knowledge should you consider using it.
Otherwise, if you submit a manuscript that’s riddled with misused semicolons in place of periods and commas, your editor will be one unhappy camper. Take it from me.