Sections not working

I would like to list all sections in Posts. But using {{ range .Sections }} doesn’t work for. Is the section not setup correctly?
:

Your code works if your content has this structure:

content/
├── posts/
│   ├── bar/
│   │   ├── _index.md  <-- the presence of an _index.md file makes this a section
│   │   ├── bar-1.md
│   │   └── bar-2.md
│   ├── foo/
│   │   ├── _index.md  <-- the presence of an _index.md file makes this a section
│   │   ├── foo-1.md
│   │   └── foo-2.md
│   └── _index.md      <-- the presence of an _index.md file makes this a section
└── _index.md

Thanks a lot for your help.
Now i would like to get the Name of the Section.

{{ range .Sections }}
$sectionName := .Section }}

But this gets me ‘posts’ instead of ‘bar’.

A section is a page so use page title.