Use iwd to Connect to a Network on Linux
If you're in a fresh install of linux and stuck on the command line but need to connect to wifi, you can use the iNet Wireless Daemon (iwd) by interacting with it via it's client iwctl. Once you start up the iwctl command prompt, you can scan and connect to a wireless network.
$ iwctl
[iwd]# device list # find the name of your device, likely wlan0 for wifi
[iwd]# station wlan0 scan # scan for networks
[iwd]# station wlan0 get-networks # list available networks from the scan
[iwd]# station wlan0 connect [SSID] # connect to your network