This is very nicely done (although it's largely a duplicate of what I've already covered in my tutorial).
I'm afraid, though, that I find the large number of spelling mistakes in your "boxes" to be rather off-putting to read. The errors completely distract one from the actual content.
I'm guessing that English is not your first language? Could you, perhaps, have it checked by a native speaker of the language, and then correct it? It really would improve what's an excellent piece of work.
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