I used this when setting up mesh WiFi for my parents, a few years ago. I set up a guest network and a main network; the guest network had a fairly-long passwor

I used this when setting up mesh WiFi for my parents, a few years ago. I set up a guest network and a main network; the guest network had a fairly-long password, and the main network had a very-long password, both WPA2-Personal. I put together a two-page PDF, page size about 4 inches by 6 inches. One side had the info for the main network; the other side had the info for the guest network. "the info" included the SSID, the password, and a large QR code. I then sent the PDF to FedEx, printed on card stock, double-sided, and laminated, with instructions to cut the excess paper away before laminating. The result was a nicely-put-together "quick reference" card that my parents can use for whatever needed. If my parents get a new phone, putting it on WiFi is as simple as a QR-code scan.