Besides using a data cable to transfer to/from a computer, I suppose you could use Bluetooth or FTP (over WiFi) to transfer files. For the latter, I sideload SwiFTP onto my phone and use FileZilla on my PC (this article shows that you don't need to even use a special client), but there are other options.
You may need an app from the Playstore to do the BT transfer or phone to phone transfer.
I still like using SwiFTP myself to/from a computer. In this way I don't have to needlessly cycle the usb connector on the phone.