How do you create mini animations?

I read in a tech blog, that "mini animation" are the new trend of web developing in 2020. But I am absolutely not able to build mini animations like small previews of software tools on website. I test some software for animations, but that complicated, are there no easy way to build mini animations?
Something like this:
https://media.sproutsocial.com/uploads/2016/11/Mobile-App-Update-Animation_Updated.gif