How do i make soemthing go slow and then faster

title is what i want to happen

It sounds like you want the “Ease” behavior.

It can be used to transition from one value to another. There are a variety of settings for it like Exponential, Sine, Back, etc. so you’ll need to experiment with what works best for the effect you’re trying to achieve.
When you click on the behavior, you can also view the Help guide for it which will explain how it works.