Got questions about grammar, style or usage? You may well find the answers at one or more of these sites. There are plenty of other good places to look, of course, both online and off, but these sites are certainly helpful. Some people actually find them engrossing, compelling … even habit-forming. Check them out for yourself.
60+ English Grammar Resources for Fun & Effective Learning – A near-encyclopedic listing of grammar resources; don’t be intimidated – check it out!
Choose Your Words – A wonderful guide through the minefield of often-confused word pairs
Purdue U. Online Writing Lab (OWL) – If you can’t find the answer anywhere else, try this