Here is a List of some great resources for learning C/Objective-C and iOS Programming
|Programming in Objective-C||Stephen G. Kochan||Amazon|
|Objective-C Programming: The Big Nerd Ranch Guide||Aaron Hillegass||Amazon|
|Apple's Developer Page||Apple||Apple|
|The Core iOS 6 Developer's Cookbook||Erica Sadun||Amazon|
|iOS 6 Programming Cookbook||Vandad Nahavandipoor||Amazon|
|The New Boston Video Tutorials||Video's by Bucky||The New Boston|
Setting up Theos
Follow the Guide to Setup your Theos Environment by installing theos, getting your headers, and creating your first project.
Finding Example Projects
Here is a list of just a few of the many open source projects that can be used as example
Not finding what you are looking for? Try Searching through GitHub for iOS Tweaks with a simple trick, "extension:xm".
Using the above code will search GitHub for all files with the extension .xm(which is Theos by default creates Tweak.xm file when creating a new tweak). In the case above it will result in finding tweaks that reference SBAwayController. Just to note all developers do not use the .xm file extension but a large number do and this will help you in finding those examples.