Adb

Download the platform tools here

You will need usb debugging enabled for this to work

Useful commands

  adb devices

  adb shell

  adb reboot download         Download mode
  adb reboot bootloader
  adb reboot recovery         TWRP if available

Errors

error: device unauthorized.
This adbd's $ADB_VENDOR_KEYS is not set; try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.

   Try Revoke USB DEBUGGING Authorization.
   Enable USB debugging again.

Check the screen and make sure you allow the PC for always.