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I'm such a rookie... Will Kraken have separate accounts for each crypto, like Coinbase to transfer easily to and from each to keep things simple?

Short answer, yes; however you should only store it on the exchange (coinbase, kraken, etcetera) when you are buying or selling it. Think if Kraken like a crypto currency version of E-Trade.

So I should have them ALL offline on a back up hard drive?

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