Been gone for too long and may need some help

I'm not sure if this is the right board for this, but I've been away from the game for a little over a year now according to my match history. A lot has changed in that time obviously. New items, new champs, and of course an ever evolving META. I've only been keeping up with the champion spotlight updates as they come up on Youtube so I'm wondering if there is like a link or a webpage that can fast track me getting up to speed on the game as a whole?

Learning the ins and outs of items is probably my main priority at this point as there is a lot of them that I don't recognize at all. And then there is the essence system and i think there were keys or something last time I played? There's a lot for an old player to learn and relearn lol.

Any help would go a long way as I do want to get back into the game, but I wanna make sure I've got at least a baseline knowledge of what i'm getting into again.

[sg-zephyr]