Post Content Slot
The Post Content Slot pulls Gutenberg-based content into Etch. It's used almost exclusively when creating templates.
Instead of pulling Gutenberg's content into a template with a dynamic data tag like {this.content}, you should pull Gutenberg's content with the Post Content Slot {@post-content}.
In older versions of Etch, the Post Content Slot was represented as {@slot content}.
It has since been renamed to {@post-content} to better reflect its purpose and to prevent conflicts with the generic {@slot} syntax used in components.
This change also frees up the name "content" for use as a generic slot.
No user action is required, existing templates will continue to work without modification.
When editing a template, you'll see the icon for the Post Content Slot in the Element Bar:
Click that icon and Etch will insert a Post Content Slot for you automatically.
Index Template
In your Index Template, the Post Content Slot usually goes inside of a main tag:
<main>
{@post-content}
</main>
Blog Post Template
In your Blog Post Template, the Post Content Slot usually goes inside of a article tag:
<article>
{@post-content}
</article>
It's your job as a developer to determine where the content should be appropriately injected into any given template based on the structure of that template.