Help is needed to learn the article Code History: Creating the Game Model

Hi, I would like to understand the topic of Swift Development in one of the articles.
https://www.codecademy.com/paths/ios-developer/tracks/building-code-history-part-two-swiftui/modules/building-the-game-model-swiftui/articles/creating-the-game-model

I am having difficulty of understanding the code line to line.

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Same for me, this is an advanced subject that they treated much too quickly, they should have made the same code with methods (much easier to read) instead of calculated properties and possibly presented after a version with calculated properties which are in the way they wrote it, reserved for experienced programmers only.