Have MacBook Air that I wish to connect to an Anke storage device that has USB ports. What cable do i use?

What ports does the computer have? What type of USB port does the storage device have? You need a cable that connects both ports. Possible an adapter may be needed. You will find what you need at Amazon.

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If you have a recent MacBook Air with USB-C ports one option would be: USB-C to USB Adapter - Apple

OK. What you need is a Female USB-A to Male TB3/USB-C adapter. The cable you need is a standard Male USB-A to Male USB-A. One end of the cable connects to the Anker device and the other end connects to the adapter's Female end.

You'll find both at Amazon.