Computercraft Tutorials
Contrary to the name, this applies not just to basic Computercraft, but also CC:Tweaked and all other ports of the mod for modern versions.
Lesson 0: What is Computercraft?
Lesson 1: LUA Basics
Lesson 2: Peripheral Basics
Lesson 3: Printers & Disk Drives
Lesson 4: Networking
Lesson 5: GPS Systems & Wireless Networking
Lesson 6: Turtles
Lesson 7: Pocket Computers