Websites, and applications, have a fundamental detail before starting to offer a product to users. The design is very important, the elaboration of the menus, the colors and many other details, are fundamental because they can give us much game with respect to the appearance of our application.
Whatever the theme you have in your project, you will find suitable ui kits, templates and mockups to work on it. If you want to make an app to help people, you can use the HelpScout Templates
. Where there is a lot of variety of elements and where you can see also the compatibility with mobiles, having with the best cell phones in the market.
Take a look at the Help Center Templates website.