Even if you've been writing for fifty years and have learned every grammar rule or writing technique known to man, you'll still be able to find an online course on the list below that’ll strike your fancy. Because, if you’re truly a master of the written word, the only thing you'll ever be certain of when writing is that language rules and trending writing techniques change all the time. This is what makes writing exciting, whether you're writing case studies, proposals, web copy, or a detailed report. If you write for a living, then you need to constantly improve your writing skills.