I know what you’re thinking: Whatchu talkin bout fool? What I’m talking about is changing content based on the device of your user. What I’m not talking about is moving stuff around with css and using display: none a bunch. I’m talking about never showing the content or showing different versions of content to mobile devices or tablets. I have seen this idea mentioned very briefly in many posts, but nobody seems to tell you how or why to actually do it. So that’s what I’m going to try to answer here.