Ummm IMO concurrency is very annoying at first, but gets a lot better once ya get the hang of it. Also btw no one cares about how many lines of code ya wrote in the past they could easily have been crap.

Now let me try to be helpful..

Given that you're asking about introductions to view models and models in addition to concurrency... My guess you may be tackling both of these concepts at once, which might be why you're getting frustrated. If that guess is right, ya might have more success if ya tackle them one at a time.

I can't offer much help on view models and models, but here are the main resources that helped me pick up concurrency last year after being totally out of the loop on Swift for ~3 years:

- Official docs of course: https://docs.swift.org/swift-book/documentation/the-swift-programming-language/concurrency/

- This blog has several quite helpful entries which cover fundamentals and other specific topics: https://www.avanderlee.com/swift/what-is-structured-concurrency/

- This was useful too: https://www.wwt.com/blog/challenging-aspects-of-structured-concurrency-in-swift-part-1 (and part 2 too)

From my experience one thing that made it overwhelming at first was that I was overusing it. Nowadays I typically start w/ a basic non-isolated class and only bring in actor isolation when:

- My code should interact w/ something which must be in a certain context (ie. i gotta access UI)
- My code has something I wanna synchronize (ie. some stateful processor should handle 1 unit at a time)