prepare new os for raspberry pi

instruction.md

Enable SSH before first boot (headless)

create an empty file with the name ssh in the boot partition

Setup Wifi before first boot (headless)

create a file named wpa_supplicant.conf in the boot partition. more details about wpa_supplicant

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=<country-code-of-your-wifi>

network={
  ssid="name-of-your-wifi"
  psk="password-for-you-wifi"
  key_mgmt=WPA-PSK
}

Example

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

network={
  ssid="wifi"
  psk="123456"
  key_mgmt=WPA-PSK
}

wpa_supplicant.conf

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

network={
  ssid="<Name of your WiFi>"
  psk="<Password for your WiFi>"
  key_mgmt=WPA-PSK
}