Stack vs Sequence

Hi, I'm learning how to use SmartFade ML. I can't seems to wrap my head around the concept of Stack vs Sequence... could anybody please help clarify?

What I'll need to do is to set up scenes as well as animating lights for Children performances. I'm able to do this manually (ie. setting the intensities/devices/parameters, and using the blackout + clear button during scene transitions). To advance my skill, I'm trying to learn how to save/prepare these beforehand, then just "play" the recordings. So should I use Stack or Sequence? Any tutorial/demo videos I can use to learn? (the official ones are only "introduction"....)