I tend to learn new things with the objc.io videos (paid subscription to all video. Worth every cent/penny) I also subscribed to the iOS dev weekly email by Dave Verwer. nshipster has great content. Also following the right people on twitter leads to great articles.

I tend to avoid medium article as there is a lot of noise about the “cool-new-thing-that-everybody-should-do”.

If you want to get into iOS programming, find an app that you like that seems easy enough and try to recreate it. Also don’t follow blindly random tutorial. Try to understand what you are trying to achieve and how other (more than one) people solved it.