Method - 1:

USB Tethering: USB tethering is the easiest and fastest method to share your Android Phone’s internet connection. I prefer USB tethering over WiFi or Bluetooth tethering, mostly because USB tethering doesn't consume your Android phone’s battery and I can enjoy the full speed of my Phone’s 3G connection.
  • Connect your Android phone with your PC using a USB data cable.
  • Open your Android phone settings and tap on Developer options –> Enable USB debugging.
  • Go back and tap on “more settings” under wireless and network.
  • Tap on “Tethering and portable hotspot”.
  • Next tap on “USB tethering” to check it and enable USB tethering . Now you can fire up any browser on your PC and you can surf the internet with Android phone’s internet connection.

Method - 2

WiFi Tethering: WiFi tethering comes second to USB tethering in terms of speed and also at the same time it consumes your Android phone’s battery. But the main advantage of WiFi tethering , is the ability to share your Android phone’s internet connection with multiple devices at the same time.
  • Open your Android phone settings and tap on “more settings” under wireless and network.
  • Tap on “Tethering and portable hotspot”.
  • Next tap on the button next to “Portable Wi-Fi hotspot” to enable WiFi tethering.
  • Tap on Set up Wi-Fi hotspot to configure your own network SSID and security  key. Alternatively you can also directly use the default password provided to connect to your phone’s WiFi hotspot.

Method - 3

Bluetooth Tethering: Bluetooth tethering is the slowest in terms of speed, but it consumes less battery as you can only tether with one device at a time using Bluetooth tethering . It can come very useful when sharing internet connection with old gadgets and devices, as most of them come with an inbuilt Bluetooth capability.
  • Open your Android phone settings and tap on “more settings” under wireless and network.
  • Tap on “Tethering and portable hotspot”.
  • Next tap and check “Bluetooth tethering” to enable Bluetooth tethering.
  • Now your phone will be discoverable on any bluetooth enabled device and you can access your phone’s internet connection