I just gave away my last copy of Adcult USA, so I zipped over to Amazon™ to buy two more. I’ve bought eight — eight! — copies of this thing since I first read it.
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Core Data Mastery
If you're an iOS developer, you absolutely need to get a copy of Core Data Mastery from Big Mountain Studio. It is hands-down the best resource for learning how to use Core Data with SwiftUI.