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How to configure the collections in Netlify CMS
Using the Netlify CMS for the first time was very confusing. I didn't really know what I was doing and I just copied the code from the setup tutorial and hoped it work. In particular, I had no idea what was going on behind the scenes or how to change the template in the CMS user interface (UI) to match the pre-existing posts format. I finally got to the bottom of it after a bit of playing around and reading the Netlify CMS documentation here.
The content displayed in the CMS editor UI is defined in the
collections field of the config.yml file and these collections are then displayed in the left sidebar of the Content page of the editor UI. This is what the collections setting in my config.yml looks like:collections:
name: "posts"
label: "Posts"
folder: "posts/"
create: true
slug: "{{year}}-{{month}}-{{day}}-{{slug}}"
preview_path: "posts/{{slug}}"
fields: # The fields for each document, usually in front matter`
- {label: "Layout", name: "layout", widget: "hidden", default: "layouts/post.njk"}
- {label: "Title", name: "title", widget: "string"}
- {label: "Description", name: "description", widget: "string"}
- {label: "Publish Date", name: "date", widget: "datetime"}
- {label: "Tags", name: "tags", widget: "string"}
- {label: "Body", name: "body", widget: "markdown"}The first collections option is
name, which acts as the collection identifier and is used when referenced, such as the collection URL. So in this case the name is posts and the URL of this collections in the Netlify CMS is admin/collections/posts. Next is
label, which is simply the name for the collection in admin user interface as shown below. If no value is given it defaults to the name value. 
The
folder option specifies the location of the collection items within the site structure relative to the root.The
create option is a boolean value which determines whether a new item in this collection can be created. It is set to false by default.The
slug option specifies a template for generating new filenames of the collection document type. A slug is a human readable, unique identifier and in the example below it specifies a template for generating new filenames based on a file's creation date and title field.slug: "{{year}}-{{month}}-{{day}}-{{slug}}"The first 3 template tags are for the date and the last tag
{{slug}} is a url-safe version of the title field for the file. If the title of the post was "My new post" and it was posted on 21st February 2021, the slug option would output 2021-02-25-my-new-post.md as the name of the new document.The
preview_path option is a string denoting where the collection documents are found on the deployed site to allow a preview of the document. If it is not set, the "View Preview" button in the editor UI will take you to the root of the site. In this example posts/{{slug}} is the folder location of the collection, followed by the {{slug}} tag. In this case, the {{slug}} is the entire slug for the current entry defined in the slug option above, and not just the url-safe identifier.The
fields option allows the definition of attribute fields that each correspond to a widget in the editor UI. Each of these attribute fields is nested in the fields option and placed within curly braces. In a nutshell, the fields option allows the user to build a template, and the field attributes in the fields option should be the same as the attributes in the front matter of the corresponding document type. Below is an image which shows the config.yml for the editor UI on the left, and a markdown file (a blog post) on the right.
Like the
collections options, the name option is the field identifier, and the label option is the name for the field in the editor UI. The
widget option determines the data type of the attribute field and the corresponding editor UI. Most of the data types are fairly self explanatory but there are a lot of options. The one that is perhaps less obvious is for the layout field. {label: "Layout", name: "layout", widget: "hidden", default: "layouts/post.njk"}The widget option of
hidden, hides it from view meaning it cannot be changed in the editor UI. The default option sets the default value of the field as the path to the template for the document, in this example layouts/post.njk. There are numerous options for fields and if you want to know more check out the widgets section of the Netlify CMS documentation here.The
required option is a boolean value which is enabled as true by default, making all fields required. It must be set as false to make a field optional.Body is a special field that needs to be included in documents that contain front matter. It must have
name:"body" and represents the section of the document that contains the main content or body, similar to a HTML <body> tag.Important! It is worth noting that order of the fields in your Netlify CMS
config.yml file determines their order in the editor UI.41