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Learn Assembly

A free, interactive online Assembly course. You write real x86-64 code on every lesson, with AI hints when your program segfaults or the registers don't hold what you expected, and a free certificate when you finish.

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View syllabusAssembly playground

1,000+ codders enrolled

45 lessons27 challenges334 quiz questions

  • Beginner friendly
  • sparkles iconAI-assisted coding help
  • hint iconHands-on interactive lessons
  • volume On iconAudio narration on every lesson
  • quiz iconQuizzes to test your knowledge
  • certificate iconFree certificate of completion

Syllabus

1 sections1 projects45 lessons27 challenges334 quiz questions
  1. Section 1

    Fundamentals

    Start sectionStartExpandCollapse    Build a strong foundation with essential concepts and basic skills45 lessons27 challenges334 questions1 project

    The Machine

    6 lessons51

    Number Systems

    7 lessons59

    First instruction - MOV

    9 lessons867

    Data Definition

    8 lessons862

    Exit Syscall

    4 lessons326

    Write Syscall

    8 lessons862

    Hello World

    Project3 lessons7
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
4}
5
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Input
"Alex"
Output
"Hello, Coddy! Alex"

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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

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January 2026

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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.

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

Challenger League
Challenger LeagueTop 7 advance
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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.

CoddyCertificate of Completion
This certifies thatJohn Doehas successfully completed
PythonPython Fundamentals
Verified
DateJan 2026
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Why learn Assembly with Coddy

  • Write and run real x86-64 Assembly in your browser. No NASM install, no linker setup, no Linux VM - each lesson assembles your code with nasm -f elf64, links it with ld, runs it server-side, and shows the output and any errors instantly.
  • Assembly the way it actually works: registers (rax, rdi, rsi, rdx), the mov/add/cmp/jmp instruction set, the stack, memory sections (.data, .bss, .text), labels, and talking to the kernel directly through the read, write, and exit syscalls - no libc hiding the details.
  • AI hints walk you through the parts that trip everyone up - why a program segfaults, which register a syscall expects its argument in, the difference between a value and the address that holds it, and how the stack grows - so you build the right mental model of the machine from lesson one.
  • Free Assembly certificate when you finish. A credible signal for systems, embedded, reverse-engineering, security, and compiler roles - the kind of work where knowing what the CPU actually does sets you apart.

Frequently asked questions about learning Assembly

What is Assembly used for?

Assembly is the human-readable form of the instructions a CPU runs directly. It's used where you need full control or full understanding of the machine: operating system kernels and bootloaders, embedded and firmware code, performance-critical inner loops, compilers and JITs, reverse engineering, and security research (exploit development, malware analysis). Even when you never write it day to day, reading Assembly is how you understand what your high-level code actually compiles to.

Is Assembly hard to learn?

Assembly has very few concepts - registers, memory, a handful of instruction types, and jumps - so the language itself is small. The hard part is that it does almost nothing for you: no variables, no types, no print, just bytes and syscalls. The course introduces one idea at a time, starting from a single write syscall and building up to input, arithmetic, loops, and the stack, so the machine model clicks gradually instead of all at once.

Which Assembly does this course teach - x86, ARM, NASM?

It teaches x86-64 (64-bit Intel/AMD) Assembly in NASM syntax on Linux - the most common target for learning and the one most tutorials, books, and Stack Overflow answers use. You write in NASM's Intel-style syntax (mov rax, 1), assemble with nasm -f elf64, and link with ld. The concepts - registers, memory, the stack, syscalls - carry directly over to ARM and other architectures later.

Do I need to install NASM or a linker to take this course?

No. Every lesson assembles and links your code in a sandboxed Linux environment and shows the output next to your program. There's no NASM to install, no ld flags to remember, and no virtual machine to set up - you write x86-64 Assembly in the browser and press Run.

Should I learn C before Assembly?

It helps but isn't required. If you already know C, Assembly demystifies what pointers, the stack, and function calls really are at the hardware level. If you don't, this course still starts from zero - it just means a few ideas (memory addresses, the stack) are brand new rather than familiar. Many people actually understand C far better after seeing the Assembly it compiles to.

Do I get a certificate after the Assembly course?

Yes. Finishing the Assembly course gives you a free certificate of completion - a verifiable signal you can add to your resume or share on LinkedIn alongside any low-level, systems, or reverse-engineering projects you've built.
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Learn Assembly with Coddy

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