How to learn how to create applications for os x?

Question

Objective-C

Hello!
A request to the audience - leave materials that can help in studying the issue of programming under os x
Preferably under modern xcode :) Otherwise
I want to learn how to write applications for os x, and Google gives out materials for 2008 ...
Ps Preferably in Russian)

Answer 1

I advise: https://www.youtube.com/channel/UChR0_wfiEHRy9TQIN...

Answer 2

Take a look: Habr , a lot about iOS, but there is also about XCode.

Answer 3

Check out the iOS Application Development site.

Answer 4

https://vk.com/iosdevcourse