When a file is created by default the following frontmatter is created automatically:

---
title: "Archetypes"
date: 2019-12-30T12:01:11+01:00
draft: true
---

template for this is in archetypes/default.md

---
title: "{{ replace .Name "-" " " | title }}"
date: {{ .Date }}
draft: true
---

This is an archetype. The default page used when new content is created. It can be modified to include additional frontmatter.

Creating a dir_name.md file in the archetypes folder will create a template for the files created in that folder. It will override default.md.