Ionic creator to custom theme possible?

Hi Guys,

New to ionic, getting my head around it all.

I am a tad confused about 2 things.

  1. Ionic CLI vs Creator… from my understanding they serve the same purpose except you can simply use creator to cut time instead of manually calling components in code (cli), is this correct?

  2. If i develop the basic interface of my app in creator, is adding themes (materials?) as simple as replacing CSS files of my exported creator project?