The magazine MagPi is often the best place to find great articles for beginners and enthusiasts alike. So, here are a few great issues and other resources to help get you started.
Start Here
RaspberryPi.org has an amazing step-by-step guide online to help you! 
For those that prefer to read a publication: The Updated Beginner’s Guide
Beginner’s Guide – in Video Form!
Quick Questions?
Master the Terminal – RPi Command Line Cheat Sheet
Volumes for Educators
Teach and Make with Raspberry Pi
Simple Electronics with GPIO – Take control of the real world