Steps to check that if the Device is connected correctly
There are two ways to check the connectivity of your device with your computer via data cable:
Through Command Prompt
Through Device Manager
Command Prompt

1) Go to Run and type ‘cmd’ for opening the Command Prompt interface.

2) Type ‘adb devices‘ in the window.

This will display all the list of android devices attached to your computer. Don’t worry about the name, as it displays the binary name of
your device.

Device Manager
Another (easier) method of checking whether your drivers have been installed correctly is, connect your phone to the PC, and don’t turn
USB Storage/ Tethering on. Start Device Manager, your device should be listed as Android ADB Interface as shown in the snapshot