The metadata section looks like this:
---
layout: page-steps
language: <programming language>
title: <operating system>
permalink: /<programming language>/<operating system>/
redirect_from:
- /<programming language>/
- /<programming language>/<operating system>/step/
- /<programming language>/<operating system>/step/<step number>
---
language: Required; Programming language the tutorial is for. Example: C#, Python, Ruby, etc.
title: Required; Operating system/platform for the tutorial. Example: Ubuntu, RHEL, SLES, Windows, macOS.
permalink: Required; Programming language and the operating system the tutorial is for. If this is a C# tutorial, please use the full word "csharp" in this section.
redirect_from: Required; Programming language, operating system, and step number. If this is a C# tutorial, please use the full word "csharp" in this section.