hugo/docs/content/en/methods/site/Sections.md

title	description	categories	keywords	action
Sections	Returns a collection of first level section pages.			related returnType signatures methods/site/AllPages methods/site/Pages methods/site/RegularPages page.Pages SITE.Sections

Given this content structure:

content/
├── books/
│   ├── book-1.md
│   └── book-2.md
├── films/
│   ├── film-1.md
│   └── film-2.md
└── _index.md

This template:

{{ range .Site.Sections }}
  <h2><a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a></h2>
{{ end }}

Is rendered to:

<h2><a href="/books/">Books</a></h2>
<h2><a href="/films/">Films</a></h2>