If you’re a web developer you’re invariably spending a lot of time in browser development tools, be it Chrome’s DevTools, Safari’s web inspector or Firefox’s Firebug. I find that Chrome really leads the pack with its DevTools, and this awesome, free interactive online course by Code School and Google can take you from newbie to expert. I considered myself pretty solid with DevTools knowledge, but with a quick review through the lessons I learned a lot of little tricks as well.