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iOS Object-Oriented Objective-C Diving Deeper - Classes, Properties and Methods Creating Custom Classes

.h , .m and main.m files and Best Book for Objective-C

Why are there 3 files there? I mean I thought TableCheck.m would be our main file and TableCheck.h will be the header file used in it... and could you please suggest a good book for Objective C so that it can show me the syntax in print and stable form , and I won't have to replay videos zillion times just to memorize one line for challenges:-)