Good Resources to Learn iOS Development

The two I can think off of the top of my head are Paul Hudson's web site https://www.hackingwithswift.com and the old Ray Wenderlich site which is now called Kodeco https://www.kodeco.com/home.

Another good resource is Standford's CS193p - Developing Applications for iOS using SwiftUI which is online at https://cs193p.sites.stanford.edu.

Should be more than enough to get started.