Did you catch that? The grammatical error in the title? You’re making a mistake if you didn’t.
I made that error yesterday over Gchat to a close friend of mine. While I am going to excuse it due to the informal typing mode I was using, there is no excuse for grammatical mistakes. It just makes you look like a bad writer – or worse – stupid when you might be the best and brightest writer out there. So, unless you are one of those confident grammar types (like my friend) then you should use this time to refresh yourself on the basics. There are hundreds of books and online resources with little quizzes and lessons. I use Grammar Girl a lot for when I have questions. Even if you do only one small lesson/quiz a day it will only make you more confident and a stronger writer. Now, go learn something.