Headless RPi enable SSH WIFI & set USER

SSH:

Create a empty file in the root of boot partition named "ssh" (no extension).

touch /mnt/boot/ssh

USER:

Create hashed password with

echo 'password' | openssl passwd -6 -stdin

Create a file in the root of boot partition named "userconf" (no extension)

echo 'pi:hashed-password' >> /mnt/boot/userconf

WIFI:

Create a file in the root of boot partition named "wpa_supplicant.conf" with the following content 


country=CZ
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
    ssid="NETWORK-NAME"
    psk="NETWORK-PASSWORD"
}