# make sure your device is enabled
nmcli radio wifi

# if shows as disabled turn it on
nmcli radio wifi on

# find your network name if you don't know it
nmcli dev wifi list

# connect to open network 
nmcli dev wifi connect SSID

# connect to protected network
nmcli dev wifi connect SSID password PASSWORD

# connect to protected network with password prompt
nmcli --ask dev wifi connect SSID