Nice! I'm writing a course on SignalR at the moment and loving going back through the framework

3. When to use async
Use async when your code spends a lot of time waiting:
- Database queries
- API calls
- File & network operations
Don’t use it for CPU-heavy tasks (sorting millions of records). That’s where multithreading or parallelism shines.

2. Async vs Multithreading They’re not the same.
Async = one thread, juggling tasks by pausing/resuming them
Multithreading = multiple threads working at the same time
Async is about efficiency, not brute force parallelism.

1. What async actually means Async programming lets your program start a task (like reading a file or calling an API) and then move on without waiting for it to finish.
Instead of blocking, it promises: 👉 “I’ll let you know when I’m done.”