Check out this great visual of common writing mistakes, be they in blogs or elsewhere. To an editor, this is one of the greatest and most useful infographics out there! Thanks to Mary Chong at Calculated Traveller for bringing it to my attention. (Infographic from GrammarCheck.net)
Of course, if you’re feeling overwhelmed with all of these things to look out for, if you just don’t have the time, or if you have trouble editing your own work, hire an editor! After all, that’s what we’re here for.