If you want to learn iOS or Android, I highly recommend Ray Wenderlich
It's a reference in the iOS world. One friend who is lead developer iOS told me that it was the #3 website for learning iPhone, just behind Apple and Stack Overflow.
More recently they started to also cover Kotlin and Android. And unless you like the terrible documentation from the Android Framework team I would start here instead.
Good job, it looks great. Paid, but great 😻😻😻
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