Newbie questions

  1. Can anyone recommend a build for me? Im in a wonky space without Goatenks, Great Ape Vegita, or the SSJ4 duo.
  2. How does stat stacking work? Specifially with the units on my team, what is their role/strategy for late game content? The UI is kinda wonky in explaining how they should be used. I kinda brute force my way through a lot of content but im getting closer to difficult content and i feel like im not doing things right.