How to learn Xcode + Swift + OS X?

Question

macOS

I want at the moment for myself, but with an eye on the future commercial component, to write a couple of software for applied information processing on the MacBook.
The main "stupidity" I have at this stage is not in the code, but in understanding the "layout" of the code with windows. Here is the second day don't know how to solve How to change the content of NSTextView in Xcode?
Yes, there is a book on swift from apple and even a course on the internet for several lessons, but there the work goes with PlayGround, and I need a window application and I understand that this is Cocoa. And there, purely code and language are dismantled.
Yes, there are Xcode courses and they are all ObjC and old version Xcode. And I need swift and work with the current version.
And 99% of what I found on the Internet is dedicated to iOS, as if everyone wants to write only for iOS, and no one needs OS X at all. It's kind of the opposite for me.
So what should I study?
I give preference to learning in the style of "took-done-understood" and "there was a problem, found a solution", and not "I read three Talmuds and watched 6 video courses, but I still don't know where the compilation button is."

Answer 1

Here are some great obj-c and swift video clips.

Answer 2

I tried a lot of things myself, here I’ll just list the resources that I tried with my impressions:
https://vk.com/iosdevcourse - Skutorenko’s course, an excellent course, especially on ObjC, somehow I didn’t go on Swift, it assumes that already know objc. Simon NG - two books for beginners and advanced, in fact a collection of examples, but written very cool. As I understand one of the swiftBook courses is based on the first book. Mustache - very good for a beginner and then convenient to use as a reference
Geekbrain courses - I saw a couple of courses, some kind of horror, it seems that it strongly depends on the teacher, in one the teacher does not even know the rules for writing code, in the other, in the first lesson, he learns that most of the group has never dealt with development at all, and then starts showing immediately complex things.
swiftBook.ru - I really liked the courses, everything is sorted out, I bought a subscription, now in the process of studying. I am glad that if something has changed in the Swift update, the video is updated or supplemented.