When I build my site I always make sure it looks good on mobile first. I keep track of spacing, ease of access, easy navigation and how does it look. Access to content as fast as possible. It's always good to ask your users what needs improvement on, what looks good, how fast do you have access to content. Remember your site is a product you are marketing to a vast demographic of people, so while many of us are already used to how features work we also need to ask ourselves how is the user experience overall?