If you’re unsure how to use an apostrophe, just don’t use it. If you’re wrong, you’ll look as ill-educated as the folks at Yahoo!.
You wouldn’t want to make the mistake of putting the apostrophe in the wrong place (as it is here on yahoo.com), would you?
If you don’t know that the apostrophe goes first (in ’80s) to show the omission of the 19, then don’t use one.
You’ll just embarrass yourself if you think you can form the plural of a noun with an apostrophe like this gaffe from Yahoo! News:
and this one from Yahoo! Movies:
And I would be embarrassed for you if you used an apostrophe in a verb that isn’t a contraction:
Unsure about your punctuation abilities? Get some help. Just don’t ask anyone who works for Yahoo! for advice.