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No, Meta isn’t the right place to ask for help. I’ve moved it to Help.

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As far as I understand, the double colon is for when you want inline metadata anywhere in your note. Otherwise YAML frontmatter is inside the
---'s and must be at the top of your note.
And I don’t know if inline metadata is actually supported by Obsidian. It might be a Dataview thing only. I don’t see it in the help docs. And I don’t see inline tags showing up in my Obsidian tags. This Feature Request seems to suggest that it isn’t supported in Obsidian directly.
- The reason some people do this is because depending on your sync tools or OS’s filesystem, you can’t always rely on the creation and modified data to stay static. So people write it into their metadata manually so they can trust it stays the same. (There might be other reasons. That’s the one I know.)