There are a number of resources available to help you learn Objective C programming. If you’re looking for a good book, then “Learning Objective-C” by Stephen G. Kochan is a good place to start. This book will teach you the fundamentals of the language and how to build an application using it. There are also lots of online tutorials that can be used for free. The Apple Developer website has a number of tutorials on Objective C and related topics, including courses on Swift programming which is Apple’s latest language that builds upon Objective C as well as other languages such as Java or Python.