Need more Tutorials and best practice for stacks/frames autolayout

I’m currently struggling with the new Auto Layout feature in Sketch. The two tutorials aren’t sufficient and only show simple examples. I need more to understand how each option (Fill, Fit, Relative, etc.) affects my work.

Is it possible to create responsive designs (desktop, tablet, mobile) with one component, or is it only for manually resizing cards?

I’m currently pausing the new feature and working with Smart Layout because I need to continue with my commercial projects. At the moment, the new feature is slowing down my workflow and causing problems with my design.