Wouldn’t ya know it. There’s a rust book about async. Cant attest to its quality but it’s got 1.6k stars on GitHub as an arbitrary metric. And it’s part of the language repo on GH. 

https://rust-lang.github.io/async-book/ 

 How did I not see this? Thanks Gary 

 🫡 
Best of luck. Slap some code into nostr sometime if you have any more questions. Can’t promise I know the answer.