====== Raspberry Pi ======
I have Raspberry pi 4

Overlays configuration is done in file ///boot/config.txt//.

===== Disable WiFi =====
Disable onboard WiFi on Pi 3B, 3B+, 3A+, 4B and Zero W.
  dtoverlay=disable-wifi
  
===== Disable Bluetooth =====
Disable onboard Bluetooth on Pi 3B, 3B+, 3A+, 4B and Zero W, restoring UART0/ttyAMA0 over GPIOs 14 & 15.

N.B. To disable the systemd service that initialises the modem so it doesn't use the UART, use 'sudo systemctl disable hciuart'.
  dtoverlay=disable-bt

===== Links =====
  * [[https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README|Firmware overlays README]]
  * [[https://medium.com/swlh/top-10-tweaks-after-installing-rasbian-f433a441d698|Top 10 Tweaks After Installing Rasbian]]