Recovery, in Android, refers to the bootable partition, in which the recovery console is installed.
It contains tools to help repair your installations as well as install official OS updates by using a combination of key presses or instructions from a command line sometimes.
Android is open, meaning the recovery source code is available, so that building a customized ROM is relatively easy.
1. Getting to recovery mode is easy just follow step by step every command, so for a start turn off you phone.
2. Now proceed with combination of pressed and held buttons: Volume Down + Quick button + Power button.
3. As soon as LG logo appears you can release the keys.
4. After few seconds your phone should get into recovery mode screen.
5. And this is it! If you're intrested in how to move around then it's Volume buttons for up and down and to select something use power button.