On , I learnt ...
You can create QR codes for WiFi networks
Create a QR code for your network at https://qifi.org/ then the default camera app on most phones will recognise and prompt to join. Very slick.
Source:
This is really cool and I had no idea it "just worked" like this. Create a QR code with your wifi SSID and password, point default camera phone app at it to join! https://t.co/c1oYojdwa4
— Jeff Atwood (@codinghorror) October 26, 2020