Personal accounts are typically used for personal transactions, like sending money between friends and family, or maybe accepting payment for a few random things you sell. A business account would be for when you're actually selling more products/services, and may be receiving a 1099 from clients, and filing a Schedule C or corporate forms on your tax return. I typically recommend that you have one of each, and use them accordingly. For the second question, I'm not sure I understand what you're asking. Whatever your bank is, you can link it up to PayPal and verify it. Then you can transfer money back and forth as necessary.
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