Enter the network name and password and a phone that scans the code joins the network. Your password never leaves this computer.
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Scan the code with your phone once before printing.
No. The code is generated in your browser and the network name and password are never uploaded. The password does sit in the QR code as plain text though, so anyone you give the printed code to can see it.
Current iPhones (iOS 11 and later) and most current Android phones offer to join the network when you scan the code with the camera.
Most routers use WPA2, and the WPA / WPA2 / WPA3 option covers them. For an open network without a password choose No password.