C# — One Language, the Entire .NET Ecosystem
C# is the primary language of the .NET platform, used to build web APIs, desktop apps, real-time services, cloud-native workers, and games. It ships modern language features at a steady cadence — records, primary constructors, required members, pattern matching, Span<T> — while remaining a statically typed, garbage-collected language with a mature toolchain. This track covers the full breadth: from your first variable to source generators, CQRS, and Native AOT.
What You Will Learn
You will start with types, control flow, strings, arrays, and methods, then move into the object model — classes, inheritance, structs, records, and interfaces. The intermediate tier covers LINQ, async/await, generics, delegates, Entity Framework Core, ASP.NET Core Minimal APIs, SignalR, and Blazor components. On the backend you will work through dependency injection, middleware, JWT authentication, authorization policies, FluentValidation, rate limiting, distributed caching with Redis, and resilience patterns with Polly. Advanced courses address Span<T> and memory management, reflection, expression trees, CQRS with MediatR, message queues with MassTransit, OpenTelemetry, parallelism, and Native AOT performance optimization.
The Learning Path
Eighty-two active courses span A1 through C2. The A1 and A2 courses establish language fundamentals — variables, operators, enums, type inference, and string interpolation. B1 covers the full object-oriented model plus modern syntax like tuples, deconstruction, ranges, and collection expressions, closing with a Mini Project: Shape Library. B2 moves into the .NET runtime and its ecosystem: EF Core, ASP.NET Core APIs, gRPC, SignalR, Blazor, background workers, unit testing, and Tasks with async/await. C1 courses tackle production-grade concerns — Advanced Async Patterns, Pattern Matching Deep Dive, Advanced Generics & Constraints, CQRS and MediatR Patterns, Cancellation & Timeouts, Parallelism & Data Processing, and Span<T> & Memory. The track closes at C2 with Source Generators.
How It Works
Each course is divided into short, focused lessons you complete in the built-in code editor with real-time feedback. An AI tutor is available whenever you get stuck, and exercises run directly against a live C# runtime so you see results immediately without any local setup.