Question: Document block question

Hi everyone,
While I am getting more and more comfortable with the document mode, I have some questions regarding the document block feature:
- What is a document block good for anyway?
- Why not have the whole document in one block?
- Can one join two document blocks?
- when do I "remove the document block"
- How can I make sure that say an informational 2-D math expression inside a document block never gets executed?
-- Can I still have an equation label say for example (*) or (**) for equations that are not meant to be executed?

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