Android Studio does not see my physical device

You Have to Enable Developer Options in your phone and from there enable the USB Debugging and when you reconnect the cable you will see a popup on your phone to allow debug session from the connected PC and say yes and you will be able to see your physical device in the device list.

To enable the Developer Options there are already many articles on the internet. in most cases you have to click your Build Number a bunch of times till you see a toast saying You Are Now A developer