Great explanation of the subject. Usually, programmers, even professional ones, are so used to dealing with their peers that they tend to be vague, skipping a couple of steps when explaining concepts to others which is okay for peers but is very confusing for people who are totally new to the concept. You are the exception here as you are a talented writer. Keep it on.
Waiting for a book on Swift/IOS app development for absolute beginners written by you.