I'm not sure you should ask this question here for best results. It's really a graphic design question, not really related to Webflow.
There are two aspects and I don't know which you're seeking to get info on
- creating an animation
- generating a gif file from an animation
What would be such an animation?
Indeed if what's you're after is Motion Design, After Effect is the industry standard, but it's a very big application. Quick UI animations can be made on Mac with Keynote with great ease, I don't know if powerpoint can do this.
Photoshop also includes a timeline to create animations.
Once you get an animation, series of fils or videos, on Windows you'll be able to convert it to gif with the very affordable Affinity Designer or Affinity Photo. Users are requesting timeline features on this two apps.
Sorry for this very incomplete answer but for years now Windows has been lacking simple design tools. I believe this is going to change a it soon, as Windows getting more interest among designers lately.