There's a lot of info out there, here's my recomendations to get started:
- raspberrypi.org - lots of tutorials on here. These are the guys that developed Raspberry Pi and this is the official site.
- https://www.youtube.com/user/RaspberryPiTutorials - lots of excellent videos to help you get started
- https://www.youtube.com/channel/UCfY8sl5Q6VKndz0nLaGygPw - The Raspberry Pi Guy, lots of excellent videos to help you get started.This guy sounds very young but really does know what he's talking about.
Those 3 sources of info have been read and watched to bits and I still concider myself an absolute beginer. I did learn loads from them, but there's so much that I don't yet know. Note I used the word 'yet'.