LRTHW

Learn Ruby the Hard Way by Zed Shaw

This is an amazing resource. You can use it for free online  but I recommend buying the pdf because then you don't have to rely on the internet to work and really, it's only $2.99 Support the open source community. Buy it. :)

This is a good resource if you get stuck or need more explanation.  scroll down to the LRTHW section http://www.mkltesthead.com/p/practicum.html

• The Hard Way Is Easier
• Exercise 0: The Setup
• Exercise 1: A Good First Program
• Exercise 2: Comments And Pound Characters
• Exercise 3: Numbers And Math
• Exercise 4: Variables And Names
• Exercise 5: More Variables And Printing
• Exercise 6: Strings And Text
• Exercise 7: More Printing
• Exercise 8: Printing, Printing
• Exercise 9: Printing, Printing, Printing
• Exercise 10: What Was That?
• Exercise 11: Asking Questions
• Exercise 12: Libraries
• Exercise 13: Parameters, Unpacking, Variables
• Exercise 14: Prompting And Passing
• Exercise 15: Reading Files
• Exercise 16: Reading And Writing Files
• Exercise 17: More Files
• Exercise 18: Names, Variables, Code, Functions
• Exercise 19: Functions And Variables
• Exercise 20: Functions And Files
• Exercise 21: Functions Can Return Something
• Exercise 22: What Do You Know So Far?
• Exercise 23: Read Some Code
• Exercise 24: More Practice
• Exercise 25: Even More Practice
• Exercise 26: Congratulations, Take A Test!
• Exercise 27: Memorizing Logic
• Exercise 28: Boolean Practice
• Exercise 29: What If
• Exercise 30: Else And If
• Exercise 31: Making Decisions
• Exercise 32: Loops And Arrays
• Exercise 33: While Loops
• Exercise 34: Accessing Elements Of Arrays
• Exercise 35: Branches and Functions
• Exercise 36: Designing and Debugging
• Exercise 37: Symbol Review
• Exercise 38: Doing Things To Lists
• Exercise 39: Hashes, Oh Lovely Hashes
• Exercise 40: Modules, Classes, And Objects
• Exercise 41: Learning To Speak Object Oriented
• Exercise 42: Is-A, Has-A, Objects, and Classes
• Exercise 43: Gothons From Planet Percal #25
• Exercise 44: Inheritance Vs. Composition
• Exercise 45: You Make A Game
• Exercise 46: A Project Skeleton
• Exercise 47: Automated Testing
• Exercise 48: Advanced User Input
• Exercise 49: Making Sentences
• Exercise 50: Your First Website
• Exercise 51: Getting Input From A Browser
• Exercise 52: The Start Of Your Web Game
• Next Steps
• Advice From An Old Programmer