.NET Developer Roadmap

What C# is, how it relates to .NET, installing the .NET SDK, and top-level statements hello world.

Value vs reference types, var, nullable reference types, string interpolation and control flow.

Classes, records for immutable data, interfaces, inheritance, and properties with get/set and auto-properties.

try/catch/finally, catching specific exception types, custom exceptions, and exception filters with when.

List<T> and Dictionary<K,V> deep dive, GroupBy and Join, and deferred execution pitfalls.

LINQ queries and deferred execution, async/await with Task, generics, and delegates and events.

What .NET is, the CLR, JIT and BCL, plus the difference between .NET Framework, .NET Core and modern .NET.

The built-in DI container, constructor injection, and the real difference between Singleton, Scoped and Transient.

A complete xUnit test class with [Fact] and [Theory], and mocking dependencies with Moq.

What Git is, installing it, the three areas, and making your first commit.

What ASP.NET Core is, the middleware pipeline, and the minimal hosting model in Program.cs.

A complete example using both minimal APIs and controller-based [ApiController] routing.

Writing custom middleware, appsettings.json, IConfiguration, and environment-specific config.

Cookie auth vs JWT bearer auth, [Authorize] with roles and policies, and a complete example.

What SQL is, the relational model, and the users/orders/products schema used throughout this section.

What EF Core is, defining entities and a DbContext, and the code-first approach.

dotnet ef migrations add/database update, and a complete CRUD example against a DbSet.

Composing Where/OrderBy/Select against a DbSet, and eager loading relationships with Include.

AsNoTracking() for read-only queries, avoiding N+1 with Include, AsSplitQuery, and compiled queries.

Value vs reference types for performance, Span<T> for allocation-free slicing, and GC generations conceptually.

What containers are, how they differ from VMs, installing Docker, and your first container.

Kestrel behind Nginx/IIS, environment-based configuration, and health check endpoints.

Azure Virtual Machines, App Service for deploying web apps without managing servers, and when to choose a VM vs App Service vs a container.

Commonly asked .NET interview questions with clear, practical answers.