To learn any new tool it is important to have some goal unrelated to the tool itself. Maybe you have a pet project or a project at work you want to try it on. There is a lot on the menu on the left here, so let us give you some pointers to the most important docs to understand Overmind.
The introduction video gives you a quick overview of what Overmind is
If you use Typescript it can be a good idea to already now explore how you use Overmind with Typescript
Once you got a feel for it, the Connecting components guide will give you some more insight into how you use your state in the components
From here it is totally up to you! Good luck and please visit our Discord channel for support