Getting back into league

So I haven't played League in about 9 months and have recently attempted to get back into the game. I feel like I know nothing about the meta or any of the character changes or the new characters and this would be okay if I could play normals without it being such a competitive environment and I feel like if I don't learn these things soon I'm going to be a hindrance to my team. Are there any videos, tips, or things I should look into?