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Skill area
Async tasks, thread pool behavior, synchronization, cancellation, and race-condition risks in .NET.
Practice items tagged with .NET Concurrency.
Uses reduction, thread-local state, atomic scalar updates, or indexed output instead of mutating a shared collection from parallel workers.
Clarify the common misconception that await starts work on a new thread, and explain what actually happens for I/O-bound operations.
Explains when cleanup needs asynchronous I/O, how await using guarantees disposal, and how ownership, exceptions, DI lifetimes, and shutdown affect the design.
Design background jobs that handle cancellation, retries, and duplicate execution without corrupting external state.
Use CancellationToken to stop wasted work when clients disconnect, timeouts expire, or background operations are being shut down.
Explain why CancellationTokenSource lifetime matters and how careless timeout creation can leak timers or resources.
Preparation paths where this taxonomy appears in the track scope.