When I was just starting to create my own websites I have made lots of mistakes as a newbi. One and possibly biggest of them was not considering mobile users when creating design. So, in the end I had trouble with such users as they always bounced back from my website. In the end, I have learned from my error and started considering mobile design during development. Nevertheless, right now I can't figure out should I consider mobile design during development or just create a mobile app for the website. Or maybe both. What do you think?