Count to five. That's about how long you have to grab a viewer's attention when browsing the web. If they don't like what they see they'll move on.

A positive user experience and a user-friendly interface are top priorities when building a website or an app. Good web and app design is uncluttered, uncomplicated and intuitive to use. Avoid having several links that lead to the same page, too much text or text that is too small.

A well-done website or app should look inviting and effortlessly easy.