Bing found these results
Objective-C - Wikipedia
About Objective-C - Apple Developer
What Is Objective C? (Definition, Uses, vs. Swift)
Objective-C Tutorial - Online Tutorials Library
Foundations of Objective-C App Development - Coursera
Objective-C Hello World Tutorial | DigitalOcean
What Is Objective C? (Definition, Uses, vs. Swift) | Built In
A Beginner's Guide to Objective-C: Getting Started with iOS …
Mastering Objective-C: A Comprehensive Guide for iOS Developers
Computer Programming Languages: Objective-C