Grammar: learn it.
If you want to say that something is outdated, it’s “deprecated,” not “depreciated.” Depreciated means that something has reduced in value.
It’s “definitely,” not “definately,” “definetly,” or any other incorrect permutation of the word. Definite is related to the word “define.”
If you’re using or Canadian English, you should put periods and commas inside quotation marks, regardless of what’s being quoted. In the UK and in other places, it’s the standard to leave them out if the punctuation isn’t part of the quoted material.
People constantly write shit like “my parent’s house” when they mean “my parents’ house.” If you’re talking about more than one parent, the apostrophe goes AFTER the S.
“Cannot” is usually written as one word in academic writing. It’s technically okay to use either “cannot” or “can not,” but in general, it’s treated as a compound. It’s the one modal verb + not combination that is written as a compound, possibly because “can” ends with an N, and “not” begins with one, and people started running “can not” together to become “cannot.” It’s been treated as a compound for hundreds of years.
You don’t, have, to, stick, commas, after, every, fucking, word. It’s, fucking, annoying.
IRREGARDLESS isn’t a fucking word. (Well, actually, it is, but it’s considered nonstandard*.)
*Nonstandard doesn’t mean “substandard”; it means that it’s not acceptable for academic or professional speech and writing. You can sit around with the bros and go “irregardless” all you want, but if you write it in a paper, that’s lame. :P
