Reusable blocks, copy blocks, etc

I was writting a long text about my lacks of knowledge of these features, but …
Is there somewhere a clear (and fresh) explanation of these features?
I didn’t found out anything real clear.
Can you post, please, a link, if you have.

Modification:
Create a full design in a normal template then all reinject in the Front Page Template with all (classes, links,images, etc.)