Here's a sampling of the things on this site that happen to perfectly fit my linguistic pet peeve tag:
10 words you need to stop misspelling (I would add the word "misspelling" to this list, though the comic itself got it right.)
Flesh vs Flush
When to use "i.e." in a sentence
How to use an apostrophe
How to use a semicolon (I personally get around this one simply by never, ever using a semicolon.)
The 3 most common uses of irony (It's funny [possibly even ironic?] because the moral of this long-winded debate about what irony is and is not is "don't debate about what irony is and is not.")
What it means when you say "literally" (reference)
Beyond those, there are a lot of other things as well.
10 words you need to stop misspelling (I would add the word "misspelling" to this list, though the comic itself got it right.)
Flesh vs Flush
When to use "i.e." in a sentence
How to use an apostrophe
How to use a semicolon (I personally get around this one simply by never, ever using a semicolon.)
The 3 most common uses of irony (It's funny [possibly even ironic?] because the moral of this long-winded debate about what irony is and is not is "don't debate about what irony is and is not.")
What it means when you say "literally" (reference)
Beyond those, there are a lot of other things as well.