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Deep-dive notes and topic guides, organised by technology. Free items are open — no account needed.

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SOLID, Honestly Five principles, what they actually mean in C#, and the patterns each one produces.Five principles, what they actually mean in C#, and the patterns each one produces. Companion to "Design Patterns That Earn Their Keep."FREE
Working with bool, char, and string in Everyday C#Learn how C# boolean, character, and string types behave in real code, including comparisons, text handling, and common pitfalls that matter in production.FREE
Production Incident Triage for ASP.NET Core APIs: a Practical On-Call GuideA practical, evidence-driven guide to triaging production incidents in ASP.NET Core APIs: classify symptoms, correlate logs/metrics/traces, mitigate safely, communicate well, and close the loop after recovery.FREE
Designing Timeout Budgets for .NET APIs: A Practical WorksheetA production-focused method for dividing end-to-end API deadlines across application work, dependencies, retries, cancellation, cleanup, and safe degradation.FREE
ASP.NET Core API Resilience: Timeouts, Retries, and Circuit BreakersA production-focused guide to timeout budgets, safe retries, circuit breakers, cancellation, observability, and common .NET interview traps.FREE
Production-Grade .NET Backend Interview PlaybookA professionally designed seven-page field guide covering DI lifetimes, async cancellation, EF Core diagnosis, idempotency, retries, transaction boundaries, and 16 senior interview scenarios with answers.FREE
How to Diagnose and Fix EF Core N+1 Queries in ProductionA production-focused playbook for detecting EF Core N+1 queries, choosing projection or Include deliberately, reading SQL plans, applying scalable pagination, and preventing regressions.FREE