Its or it’s, you’re or your?
Not an issue in a text or tweet, but confusing these words can work against you in a more formal document. These common spelling mistakes are simple to avoid. When unsure, just read the sentence in question by substituting “it is” or “you are.” If it makes sense, then use the contraction (it’s, you’re). If it doesn’t make sense, then use the possessive (its, your).