Question about first five pages and last two pages of passport

I didn’t find any post about this, so just want to make sure I’m getting it right.

  1. Are they asking page number 1-5, or is it from page 0 (which is passport bio)?
  2. Are these copies need to be in separate pages? Because I have to cover the other page to scan one page at a time instead of full face including two sides.

And in case if anyone knows, why do they need first five pages? My passport doesn’t really have anything at the beginning.

Please read this guide. It has everything stepwise: