I am wondering what I can put or elaborate on that is not already contained in the Common App
I asked a similar question yesterday and was provided wonderful answers by @danny3895 and @preppedparent.
You can use the resume to provide more information about additional activities and honors that cannot all be provided in the limited answer boxes. You can also potentially show a creative side or an additional side to you that Brown was not aware of.
Are you submitting one?
Admitted ED student here. I included a resume that essentially had the same info as my common app, except with a few elaborations and a club or award here and there that couldn’t fit on the application.
Your resume should be a one page summary of your application (save a few details, of course). It will also reveal how capable you are of concisely highlighting your achievements in a clean, clear, and properly formatted manner.