This is a regular content page, with content placed in the left sidebar.

The left sidebar content is defined in the content file, and in this case is provided by the {{< sidebar/subnav >}} shortcode.

Usage

The content file looks something like this:

---
title: Content page with left sidebar
layout: content-page
---
{{< main >}}
    Main content goes here…
{{< /main >}}
{{< sidebar left >}}
    {{< sidebar/subnav >}}
{{< /sidebar >}}