Hi , Welcome to apple development.

Currently 2 languages are in use for apple development :-

1 - Objective - C. Click To Check What Google Says About Objective-C.


2 - Swift (A newly givenLanguage by Apple For Development).
 Click To See What Google Says About Swift.

FOR SWIFT TUTORIALS , CLICK HERE.

With the help of both the languages you can develop application for any Apple Platform i.e.

Iphone
Ipad
WatchOS
Mac