Little question about One-pager

The CMS Questions
1

Am I required to put all page sections in a parent page ?
(One-pager example)

Convert this:

content/
  home/
    Headline
    Gallery
    Text
    Another headline

In this:

content/
  home
  Headline
  Gallery
  Text
  Another headline
2

No, but it probably makes sense to keep your content folder clean and to have an easy way to fetch these pages.