Wondering how to change a Raspberry Pi to connect to a new wi-fi network?
(or simply connect to your HDMI monitor and a USB keyboard)
/ cd /etc/wpa_supplicant
pi@bigboy: /etc/wpa_supplicant $ ls
pi@bigboy:/etc/wpa_supplicant $ sudo nano wpa_supplicant.conf
(edit the file to include the new network ssid and password and reboot)