Learning path

C# Developer Roadmap

What to learn, in order, to work as a C# or .NET developer: the language through interfaces, generics, delegates and events, the command line, Git and SQL, then the data structures and algorithms interviews test, and code a team can maintain. Free, hands-on, in your browser, with no Visual Studio or .NET SDK to install.

START LEARNING(it's free)

340,404+ codders enrolled across these courses

585 lessons509 challenges2,620 quiz questions

Beginner friendly
AI-assisted coding help
Hands-on interactive lessons
Audio narration on every lesson
Quizzes to test your knowledge
13 free certificates along the path

The C# developer roadmap, step by step

17 courses6 sections585 lessons509 challenges2,620 quiz questions

Each step is made of existing Coddy courses, and every Start button opens them in C#. Take the steps in order, or start with the one you are missing; progress is saved per course.

1
Step 1
C#, the language under .NETDedicated page
Start this stepStartThree sections. Fundamentals covers types, operators, control flow, methods, arrays, strings and string interpolation; Logic & Flow covers multi-dimensional arrays, exceptions, null handling and nullable types, dictionaries and hash sets; Object Oriented Programming covers properties, static members, inheritance, interfaces, operator overloading, extension methods, generics, delegates and events, IDisposable, dependency injection basics and design patterns, ending in a library project with LINQ search and unit tests. C# asks for types, classes and access modifiers from day one; take the time, because every .NET framework is assembled from exactly these pieces.Start Dedicated page
3 sections, in order
205 lessons220 challenges1,292 questions
2
Step 2
Linux and the command lineDedicated page
Start this stepStartFiles and paths, wildcards, grep, pipes and redirection, permissions, environment variables and shell scripts. .NET stopped being Windows-only years ago: ASP.NET Core services commonly run in Linux containers, the dotnet CLI builds, tests and runs projects from any terminal, and settings such as ASPNETCORE_ENVIRONMENT reach an app as environment variables. When a service misbehaves on a server, there is no Visual Studio, only a shell.Start Dedicated page82 lessons68 challenges440 questions
3
Step 3
Git and version controlDedicated page
Start this stepStartStaging, commits, .gitignore, branches, merges and conflicts, undoing mistakes and remotes. On a .NET team bin/ and obj/ go in .gitignore before the first commit, project and solution files are where branches collide, and the repository often lives on GitHub or Azure DevOps. Visual Studio and Rider have Git built in; knowing the commands is how you understand what their buttons do.Start Dedicated page58 lessons46 challenges370 questions
4
Step 4
SQL fundamentalsDedicated page
Start this stepStartFiltering, sorting, joins, grouping, aggregates, subqueries, WITH clauses and window functions, on real tables. .NET applications often sit on SQL Server or PostgreSQL behind Entity Framework, and LINQ's Where, Select, GroupBy and Join mirror SQL's clauses; knowing the SQL is how you read what Entity Framework generated when a query is slow.Start Dedicated page72 lessons72 challenges360 questions
5
Step 5
Data structures, built by hand
Start this stepStartStack, queue, linked list, binary tree and hash table, each built from scratch in C# and then used on problems. .NET ships Stack<T>, Queue<T>, LinkedList<T> and Dictionary<TKey, TValue>; writing your own generic versions is how you learn what each operation costs, and why a dictionary key needs Equals and GetHashCode that agree.Start
5 courses, in order
66 lessons34 challenges
6
Step 6
Algorithms and recursive thinking
Start this stepStartRecursion challenges, then bubble, selection, insertion, merge and quick sort in C#, the sorts animated in Coddy's algorithm visualizer. Two .NET facts land differently afterwards: Array.Sort and List<T>.Sort use an unstable introspective sort while LINQ's OrderBy is stable, and a StackOverflowException from runaway recursion cannot be caught, so it ends the process.Start
6 courses, in order
62 lessons37 challenges158 questions
7
Step 7
Code other people can read
Start this stepStartAn object-oriented project built end to end and a bank of coding problems, both in C#. Readable C# is the substance of a .NET code review: names that follow the conventions, methods that do one thing, classes with one reason to change.Start
2 courses, in order
1. User Class - OOP Project8 lessons1 challenges
2. Coding Problems32 lessons31 challenges
40 lessons32 challenges

What you get

Everything you'll use to learn to code

Learn by Doing

Write real code, query databases, build websites, and master AI prompts. Our interactive lessons cover every skill modern developers need.

playground.js

Code Editor

1const greeting = "Hello, Coddy!"

2function sayHi(name) {

3 return greeting + " " + name

Test #1

Test #2

Test #3

Input

"Alex"

Output

"Hello, Coddy! Alex"

Build Your Coding Streak

Stay consistent and watch your progress grow! Track your daily coding habit, protect your streak with freeze days, and earn rewards for showing up every day.

12 days streak

Return tomorrow to keep your streak!

January 2026

Double or Nothing

Day 5 of 7

Streak Freeze

2 left

Code Anywhere, Anytime

Take your coding journey on the go! No setup, no downloads - just open and start coding. Available on iOS, Android and Web with 4.9 star ratings.

250

Variables

CONTINUE

4.9

Rating

You're Not Alone in This

Compete on global leaderboards, invite friends to earn rewards, and celebrate each other's wins. Coding is better with friends!

Challenger LeagueTop 7 advance

Alex7+ Days

2840

Jordan7+ Days

2650

Sam7+ Days

2420

Casey

2180

Morgan7+ Days

1950

Promotion zone

Every way to learn

Read, listen, test yourself, ask the AI, or look up anything you've already covered. Every lesson meets you where you are.

Intro to Variables

Audio

A variable is a named container that stores a value you can reference later in your program.

In Python, you create one by writing the name, an equals sign, then the value you want to store.

The value can change over time - reassigning the name simply points it to a new value.

1xSarah

Prove Your Skills

Earn certificates for every course you complete. Add them to your LinkedIn profile and resume to showcase your coding expertise to employers.

Certificate of Completion

This certifies thatJohn Doehas successfully completed

Python Fundamentals

DateJan 2026

Add to LinkedIn

Why follow this C# roadmap on Coddy

One language, several .NET careers. ASP.NET Core web services, Windows and enterprise software, cloud work on Azure and Unity games all use C#, so the foundation on this page opens more than one door before you pick a specialty.
The language, past the syntax. The C# course does not stop at classes: it covers nullable types, delegates and events, generics, IDisposable and dependency injection basics, ideas ASP.NET Core and Unity lean on, and ends in a library project that searches with LINQ and is checked by unit tests.
Interview practice in C#. The stack, queue, linked list, binary tree and hash table, the recursion challenges and the five sorts are all taught in C#, so you rehearse in the language you will be interviewed in.
Graded, hinted, nothing to install. Each lesson closes on a C# challenge that test cases grade; when one fails, Bugsy, the AI tutor, points at the problem without writing the fix. Most courses end with a free certificate, and everything runs in the browser.

Frequently asked questions about becoming a C# developer

How long does it take to become a C# developer?

Six to twelve months at about an hour a day is a realistic range from zero to a junior interview. On this roadmap the C# course takes six to eight weeks, the command line, Git and SQL about a month together, and the data structures and sorting steps two more. Most .NET backend jobs then expect ASP.NET Core and a data layer such as Entity Framework, which is another month or two of building something real.

What is the difference between a C# developer and a .NET developer?

Mostly the job title. C# is the language; .NET is the platform it runs on: the runtime, the base class library and frameworks such as ASP.NET Core and Entity Framework. Most .NET code is written in C#, so a .NET developer role is a C# role that also expects those frameworks. This roadmap builds the C# half and the general foundation; the frameworks are the next layer.

Is C# a good first language for a software engineer?

A good one. It is statically typed, so the compiler catches many mistakes before anything runs, and its syntax is consistent enough that the concepts stay in front of the details. It also leads straight to real jobs in enterprise, cloud and game development, and nearly everything you learn transfers to Java.

Do I need Windows to become a C# developer?

No. Modern .NET runs on Windows, macOS and Linux, ASP.NET Core services are commonly deployed in Linux containers, and Visual Studio Code and JetBrains Rider run on all three. The full Visual Studio IDE and desktop frameworks such as WPF and Windows Forms are Windows-only, so some jobs still assume Windows; for this roadmap you need only a browser.

Which course on this roadmap is not taught in C#?

One: clean code is taught in Python only so far, so it is listed after the steps rather than in step seven. Its ideas, meaningful names, small methods, one reason for a class to change, apply to C# unchanged, and .NET's naming guidelines and code analyzers enforce the mechanical part. Every step, the object-oriented project and the coding problems included, is in C#.

Is this C# roadmap free?

Yes. Every course on it is free: the lessons, the C# editor and the Linux terminal in your browser, the test-graded challenges, Bugsy's hints and the certificates. Pro removes the daily energy limit and adds unlimited AI help, and nothing on this roadmap requires it.

Other learning paths

The same courses, arranged for a different role. Progress carries over: a course finished on one path counts on every path that includes it.

All learning paths

Coddy programming languages illustration

Start the Software Engineer path for free

Start learning