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Learn C#

Learn the language behind Unity games and .NET apps, one lesson at a time.

Free to start. Built from a single prompt. No credit card.

C# is a statically typed, object-oriented language created by Microsoft that runs on .NET, which is open source and cross-platform on Windows, macOS and Linux. It is the scripting language of the Unity game engine and a common choice for web APIs with ASP.NET Core, desktop apps and enterprise systems. Its syntax will feel familiar if you have seen Java, but it adds properties, LINQ queries over collections and clean async/await for concurrency. Learnr builds you a personalized C# course from a single prompt and teaches it through short, interactive lessons, whether you want games or the web.

How to learn C#, step by step

Install the .NET SDK and create a console app. Install the .NET SDK, run dotnet new console, then dotnet run. Use Visual Studio, Rider or Visual Studio Code with the C# extension so you get autocomplete and inline errors while you learn.
Learn value types versus reference types. Understand that int, bool and structs are copied, while classes are passed by reference. This distinction explains many surprising bugs, and it matters in Unity, where Vector3 is a struct.
Design with classes, properties and interfaces. Write classes with auto-properties like public string Name { get; set; }, constructors and interfaces. Practice by modeling an inventory system or a library, then swap implementations behind an interface.
Get fluent with List, Dictionary and LINQ. Use List<T> and Dictionary<TKey, TValue>, then query them with LINQ methods such as Where, Select, OrderBy and GroupBy. LINQ replaces many manual loops once you are comfortable reading it.
Understand async and await. Learn that async methods return Task, and await them so the program can do other work while waiting on files or the network. Avoid async void outside event handlers.
Pick a track and build a project. For games, script a small Unity project with MonoBehaviour components. For the web, build a minimal ASP.NET Core API with a database. Keep a Learnr streak going on language features alongside it.

What you'll learn

Write C# programs with types, methods, loops and conditionals
Design classes with properties, interfaces and inheritance
Query and transform collections with LINQ
Write responsive code with async and await
Create, build and run projects with the dotnet CLI and NuGet packages

What's inside your C# course

A sample path Learnr builds for C#. Your real course adapts to your goal and level.

1. Setting up .NET and your first console app
2. Types, variables and control flow
3. Classes, properties and interfaces
4. Collections, generics and LINQ
5. Exceptions, async and await
6. Applying C# in Unity or ASP.NET Core

How long does it take to learn C#?

Core syntax and object-oriented basics take about 2 to 3 months at 5 hours a week. Comfort with LINQ, generics and async plus one framework like Unity or ASP.NET Core usually takes 4 to 8 months. Java experience makes C# very quick to pick up.

What you need before you start

No prior programming is required. You need a computer that can run the .NET SDK, which supports Windows, macOS and Linux, and a code editor.

Common mistakes to avoid

Ignoring nullable reference warnings. Keep nullable enabled and handle possible null values, since null reference exceptions are among the most common C# crashes.
Blocking on async code with .Result or .Wait(), which can freeze an app or cause deadlocks. Use await all the way up the call chain.
Learning C# only through Unity tutorials, then struggling outside it. Write a few plain console apps so you know which parts are the language and which are Unity.

How Learnr builds your course

Type your topic

Tell Learnr you want to learn C#, or get as specific as you like.

Get a personalized course

Learnr instantly builds a full C# course tailored to your goal and skill level.

Learn and level up

Move through bite-sized lessons and interactive practice, earning XP and keeping your streak.

C# questions, answered

Is C# only for Windows?

No. Modern .NET is open source and runs on Windows, macOS and Linux, and C# apps can be deployed to Linux servers, mobile devices and game consoles.

Is C# good for beginners?

Yes. It has clear syntax, helpful compiler errors and strong tooling. If you want to make games in Unity, it is the natural first language to learn.

What is the difference between C# and C++?

C# manages memory for you with a garbage collector and runs on .NET, while C++ compiles to native code and leaves memory management to you. C# is generally quicker to learn.