Best healer champion?

I'm new to the game, and I want to play a healersupport-champion. Which champion is the best healer? Or isn't there really one best one? If so, which ones are the best and how are they different? And is there a website where you can find a good guide for it? I did googlesearch before posting this, but it just gives me many old websites, and I doubt that all stats etc stayed the same, so those messages are probably outdated.
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