What is the best way to root my Samsung S6 device?

I am very new to this rooting. As i have very less experience in this all. I would like to know the best and easiest way to root my Samsung S6 (model: Samsung - SM-G920A). The build number is LRX22G.G920AUCU1A0CE. Also how can I update the android version to the newest version, after rooting the phone? If somebody could let me know in detail all of the software and tools required for this rooting procedure.

My android mobile is imported from America and a so a American version of the Samsung S6. I'am using the phone in London England.

Thanks.

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