Animation is important in today’s trend as it brings the sense of interaction between the users and the website or application. Be it simple or complicated, the least you should have is a hover effect on the buttons of your website.
You may have spotted some cool effects seen on websites such as Nation or Keep Portland Weird, where two or more layers of overlays are animated across the page to reveal underlying content.
This tutorial from tympanus’ codrops will teach you how you can achieve this type of animation. However, it only focuses on the animation part, and not the loading of content. It uses CSS animations to bring your transitions to life.