How do i root my device?

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http://forums.androidcentral.com – Before i begin i am a new user here so if this is in the wrong fourm please move it. Hello, I am a 2 year android user and i have never tried rooting and i would like to know if there is a way to root my device the LG L9 p768f Android verison 4.0.4 Questions: *when i root do i have to install a custom rom ? Becuase i have no problem with the default one . *Are there any dangerous to rooting ? if so what are they. *How will rooting affect my phone ? will it delete anything? Does it matter that i have a custom language on my phone? The only reason i want to root is so that i can use Di (HowTos)