You'll have zsh (bash descendent) but there's a lot missing so be prepared to rebuild most of that. Fortunately the main applications I show are browser. With other applications it can be a mix of using the macOS screen zoom, or just not having a very readable interface.
This is generally only possible with browser windows or Electron-based applications (which I typically dislike, but in this case brings a positive).
Check out their Features page to see what the fuss is about, but the nice.
This is always the first thing that I install on any Macbook that I know I'll be using, because I just like the feel, customization, and mobility that iTerm provides over native Terminal. Gosh, I don't know if I could live without iTerm2, because it's window and session management is leagues above the normal OSX Terminal.