How can I root LG optimus 4X HD P880

[mitjengrus88]

I haven't rooted my phones before. I wanted to root my two and a half year old LG P880, but a quick Google search was a mess. I don't know wich websites that are safe and wich websites that aren't. And I wonder if root guides from 2013 still work in the same way today as they did two years ago. It would be fine if you could link me to a website that offers safe and free rooting.