what is the benefit of root???

i am new anyone tell me what is root and what we can do after rooting s5 and in case if phone stop working can we restore it to factory setting using kies and install samsung software?

Will a UHS-3 card provide any benefit over UHS-1?

I ordered a new Moto G last night, and am looking at memory cards for it. I am considering opting for a UHS-3 card, but am not sure if it will provide any benefits. Thoughts?

PS: I would have thread searched, but it appears the "search within this forum" function isn't appearing or was removed.