An A to Z Beginners Guide to Installing RetroPie on a Raspberry Pi 2B+
Coding for kids is cool with this elementary guide!
Step-by-step picture guide as to how boot RaspberryPi from USB
Getting started guide for the Arduino Yun
Adafruit's guide to getting programs to run automatically on a Pi
A complete guide to do it yourself
Ultimate Guide to Windows 10 on Raspberry Pi 2