Developer Options
In order to use ADB, you first need to unhide the Developer Options. This is a one-time process. But on some OEM ROMs you might need to repeat this after every restart.
- Go to Settings → About
- Tap Build number 5 to 7 times
Developer options should appear directly under Settings or in Settings → System at the bottom.
Once enabled, you can also open the Developers Options from within the app. See the following short video guide.
Now to start using ADB, you can proceed to Android 10- or Android 11+ guide whichever applicable to your device.