My PC has an Internet connection. My Android phone does not have Internet connection. My PC has a Bluetooth adapter. My Android phone supports Bluetooth.
How I can share my PC Internet connection with my Android phone via Bluetooth?
You can download third-party software like mHotspot and make your Ethernet connection a hotspot. Or you can download other software like PDANet for Windows and PDANet+ for Windows and connect over USB, or Bluetooth. But you will need to pay for PDANet and PDANet+.