Recovery is included on a separate partition from the main Android OS on all Android devices.
You can boot directly into recovery mode and use it to factory reset the device, delete the cache partition, or apply software updates. It can help you fix your device.
1. Lets start from turning off your device by holding down power button.
2. Now when you have turned off your device, please press and hold Volume down + Home + Power button.
3. You can release the buttons as soon as you see LG logo.
4. Now wait untill you see this screen:
5. This is it, you have succesfully reached recovery mode.
6. To move use your volume buttons and power button to select.