Being able to write compelling, sound copy can mean the difference between looking like the smartest person in the room and looking like a drooling idiot. Knowing proper grammar rules (or having an editor who can remember that stuff for you) can also save you a lot of embarrassment. And even those of us who have a good grasp on language and writing hit a wall or forget a rule now and then. If you’d like to brush up on your writing skills, learn some obscure details about language, or geek out on grammar, here are four blogs you should bookmark right now.