I'm a very new player, anything I need to know?

Hi, I've just started playing LOL, I'm level 38 (?) right now. My most played Champion is Janna, with 100k Mastery, followed by Nunu and Willump, and then Yuumi. I mostly play support and I got played Bronze 1, I've pretty quickly climbed up to Silver 2, and I'd just like to know if there are any essential tips that I need to know. Thanks!
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