Complete syntax documentation

[Kevin]

I have searched and searched, but I can't to seem find any documentation
on the actual file structure, with all the various elements, in one place. 
Yes, I can find out about how curly braces work, or what << >> does, but it 
would be great if there was a document that listed each delimiter, what it 
does, and how it interacts with other delimiters. 

Thanks,

Kevin