Open the SETTINGS app.
(Only on Android 8.0 or higher) Select System.
Scroll to the bottom and select About phone.
Scroll to the bottom and tap Build number 7 times.
Return to the previous screen to find Developer options near the bottom.

At the top of the Developer options screen, you can toggle the options on and off (figure 1). You probably want to keep this on. When off, most options are disabled except those that don't require communication between the device and your development computer.

Next, you should scroll down a little and enable USB debugging. This allows Android Studio and other SDK tools to recognize your device when connected via USB, so you can use the debugger and other tools.


HOPE YOU ENJOY IT

http://www.infinix.club/ng/forum/195/811640

If you’ve ever tried to do anything advanced on your Android phone, you’ve likely heard or read the term “USB Debugging.” This is a commonly-used option tucked away neatly under Android’s Developer Options menu. However, it’s still something that many users enable without giving it a second thought–and without knowing what it does. This guide explains what USB Debugging Mode is on Android and how to enable it.

https://www.novabach.com/what-is-usb-debugging-mode-for-android-and-how-to-enable-it/