Usb drive's 2.0, 3.0?

I just wanted some clarity on the USB drives. Are they all 2.0, 3.0? And I heard that the top (or bottom) rears is 3.0. So what are the configuration? Also, if they are all different, which one should be the recommended “go to” drive if I’m using a 2.0 or 3.0 thumb drive? Thanks.

Never mind. I’ve found the answer on the following post

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