I'm not sure about barns and noble, but you can't download books from Amazon and put them on the kobo as neither of them support the others format. However, if the book is free from digital rights management, then you could put load it into Calibre, and convert it to the epub format that the kobo supports.
managing books in calibre is pretty much telling calibre where the books are and telling it where you want them to be. I'd suggest watching the tutorial video available on calibre's website to get the very basics
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