ladyynara, I thought I'd ad a few points about the idea of rooting - Mulder's link is a good place to go for instructions.
The operating system underneath Android is Linux. Linux is an operating system found on everything from tiny computers, smaller and slower than modern phones, to super computers.
The security system uses the concept of user accounts. This is the origin of the "login" prompt you've probably heard about from movies or general discussion, similar to the accounts in Windows and exactly related to the accounts of the Mac.
Supervisory over all the accounts is the super user, otherwise known as the root user.
Rooting the device merely means you're unlocking the ability to login as the super user.
This also, as a result, unlocks the ability to do things with the phone only a super user is allowed to do.
It does almost nothing else to the phone. There's very little reason to backup, or concern yourself with consequences of rooting the phone immediately afterwards.
However, if you think about the fact that a super user account is now unlocked, you should realize that viruses and malware may also gain access to your unlocked super user account, giving them more power to infect the phone.
Also, since you're no longer locked out of important commands and functions, there is more potential for you to accidentally do things which mis-configure your phone.
I highly advise you consider a little study to know what to do. It's not that tough, really.
They key points you need to know are:
- How to perform a hard reset. This restores the phone to factory settings. It's fairly simple to do.
- How to perform recovery - a re-installation of the operating system from a factory or well known, working source.
All things root has various topics to browse, and these are probably among them. Google provides otherwise.
Rooting the phone may void the warranty, or what you'll choose to do after rooting the phone may void the warranty.
It does little else by itself. You won't notice a difference at all after doing it, at first.
I HIGHLY recommend using saferoot for the LG devices.
Many of the other methods use security exploits to get into the device, but saferoot does not. Also, several of the rooting applications are actually made by Chinese sources, and are known to steal identify information (though they are very capable of rooting the phone).