All notes

What happens between a request and a response.

The runtime underneath — CLR, GC, assemblies, hosting.

Who is calling, and how the token proving it gets there.

Everything else worth writing down — tools, shell, odds and ends.

Iteration from first principles — foreach, yield, LINQ, laziness.

Files, streams, and everything that crosses a process boundary.

Messages, visibility timeouts and at-least-once delivery.

What the newest language version actually changes.

Language semantics — memory, async, immutability.

ASP.NET, EF Core and the Azure pieces around them.

Images, layers, Compose and the .NET build story.

Database in depth with Entity Framework Core and SQL Server.

Boundaries, messaging and failure modes.

Threads, tasks, async and locks — and what actually runs at the same time.

Building HTTP APIs — routing, binding, middleware, auth.

The classic patterns, in C# — and when not to reach for them.

What is actually in a token, and what signing does and does not prove.