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Learn Assembly Language

See exactly what the processor does, one instruction at a time.

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Assembly language is a human-readable form of the machine instructions a processor actually executes. Each line usually maps to one instruction, such as moving a value into a register, adding two numbers or jumping to another address, and each processor family has its own instruction set: x86-64 on most PCs, ARM on phones and Apple silicon, RISC-V in teaching and newer chips. Few people write whole programs in assembly today, but reading it is valuable for debugging, performance tuning, reverse engineering and embedded work. Learnr creates a personalized assembly course from your prompt and teaches it in short, interactive lessons.

How to learn Assembly Language, step by step

Pick one architecture and stick with it. Choose x86-64 if you use a typical Linux or Windows PC, ARM64 if you are on Apple silicon or a Raspberry Pi, or RISC-V for its small, clean instruction set. Syntax and registers differ, so mixing tutorials across architectures causes confusion.
Get comfortable with hex and two's complement. Assembly shows numbers in hexadecimal and treats signed values as two's complement. Practice converting between binary, hex and decimal and predicting what happens when an 8-bit value overflows, because flags and comparisons depend on it.
Write a tiny program that makes a system call. On x86-64 Linux, assemble a hello world with NASM, put the write system call number in rax and its arguments in rdi, rsi and rdx, then link with ld. Seeing it print proves you control the machine directly.
Learn control flow with cmp and jumps. Use cmp to set flags, then conditional jumps like je, jne and jl to build if statements and loops. Rewrite a short C loop, such as summing an array, in assembly by hand and check the answer.
Master the stack and calling conventions. Learn push, pop, call and ret, and how a function sets up its stack frame. On Linux x86-64 the System V convention passes the first six integer arguments in rdi, rsi, rdx, rcx, r8 and r9, with the result in rax.
Read compiler output and debug constantly. Paste small C functions into Compiler Explorer at godbolt.org and compare the assembly at different optimization levels. In gdb, use layout asm, stepi and info registers to watch each instruction change state.

What you'll learn

Read and write basic instructions for moving, adding and comparing data
Explain registers, memory addressing and how the stack grows
Implement loops and conditionals with compares and jumps
Call functions following a standard calling convention
Step through a program in gdb and inspect registers and memory

What's inside your Assembly Language course

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

1. Binary, hexadecimal and how the CPU sees data
2. Registers, instructions and addressing modes
3. Flags, comparisons, jumps and loops
4. The stack, function calls and calling conventions
5. System calls and assembling, linking and running programs
6. Reading compiler output and debugging with gdb

How long does it take to learn Assembly Language?

Reading simple assembly and writing small programs takes about 4 to 8 weeks at 4 to 6 hours a week if you already know a language like C. Becoming comfortable with optimized compiler output or reverse engineering usually takes several months of regular reading and debugging.

What you need before you start

Some programming experience, ideally in C, so pointers and memory addresses are familiar. Comfort with binary and hexadecimal helps, and a Linux environment makes the tools easiest to install.

Common mistakes to avoid

Mixing Intel and AT&T syntax without noticing. They reverse the operand order, so pick one, usually Intel with NASM, and check which one each tutorial uses.
Forgetting which registers a called function may overwrite, then wondering why a saved value vanished. Learn the caller-saved and callee-saved lists for your convention.
Trying to write large programs in assembly too early. Write tiny routines and spend more time reading compiler output, which is how most professionals use it.

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Assembly Language questions, answered

Is assembly language still used?

Yes, mostly in small doses. It appears in operating system kernels, bootloaders, embedded firmware, performance-critical inner loops, compilers and security work such as malware analysis and exploit development, where reading it matters more than writing it.

Which assembly should I learn first?

Learn the one your computer runs so you can test easily: x86-64 on most PCs, ARM64 on Apple silicon Macs. Courses also often use RISC-V or MIPS because their instruction sets are smaller and more regular.