Mistakes in the use of apostrophes are common. If you take a walk around locally-owned markets or shops and look at handwritten signs on chalk boards and things, you’ll likely notice at least one mistake.
If you read a draft research paper from one of your colleagues, you’ll likely also notice at least one mistake in the use of apostrophes.
If you haven’t noticed these mistakes, read on, because it’s likely that you’re making these mistakes yourself! Don’t worry: they’re common but easy to fix.