Responsive Design

I believe responsive design is important. You simply need a version of your website optimized for mobile devices. And the alternative of serving different versions through php has more downsides than responsive design especially since search engines love responsive websites.

I hate Bootstrap! You only use classes to do everything and all pages using it look basically the same... I can see it increase productivity and shorten the time needed to create a page which is why I understand people using it. But I currently don't have to maximize productivity when working on a project and thus I much rather learn more about how it works.