Software Systems AtlasA Map of Software Systems

Start with the tools, follow a role-based path, or look up one system topic

Vol 0 · Developer Workshop

Terminal, Git, IDE debugging, package management, builds, and Docker.

Open Vol 0

Vol 1 · Programming Basics

Variables, control flow, functions, OOP, collections, concurrency, and I/O.

Open Vol 1

Vol 2 · Data Structures and Algorithms

Complexity, linear structures, hashing, trees, graphs, sorting, and dynamic programming.

Open Vol 2

Vol 3 · Computer Systems

Data representation, CPUs, memory, processes, threads, file systems, and performance.

Open Vol 3

Vol 4 · Computer Networking

Layers, sockets, TCP, HTTP, TLS, DNS, QUIC, and network debugging.

Open Vol 4

Vol 5 · Databases and Data Systems

SQL, storage engines, query execution, transactions, isolation, caching, and search.

Open Vol 5

Vol 6 · Software Engineering and Design Patterns

Software construction, testing, design patterns, architecture, API design, and DDD.

Open Vol 6

Vol 7 · Distributed Systems

RPC, consensus, storage, compute, SRE, IaC, Kubernetes, and observability.

Open Vol 7

Vol 8 · Security and Cryptography

Cryptography, PKI, OAuth, web security, privacy, and software supply chains.

Open Vol 8

Vol 9 · Language Internals

Type systems, memory models, concurrency models, functional programming, and bytecode.

Open Vol 9

Vol 10 · Mathematical Foundations

Logic, sets, combinatorics, probability, linear algebra, calculus, and information theory.

Open Vol 10

Vol 11 · Compilers and Formal Languages

Automata, grammars, lexing, parsing, semantic analysis, and code generation.

Open Vol 11

Vol 12 · Data Processing and Data Science

Data cleaning, exploratory analysis, statistical inference, feature engineering, and governance.

Open Vol 12

Vol 13 · AI and Machine Learning

Search, machine learning, deep learning, LLMs, RAG, and AI system patterns.

Open Vol 13

These English and Chinese lessons connect developer tools, programming, networks, databases, and AI systems. Follow the foundations in order, or look up a problem from your project. Each volume lists its prerequisites so you can choose where to begin.

Pick an entry point

You are writing code for the first time

Prerequisite: you can install software and open a terminal.

Outcome: use Git, run a program, and inspect it with a debugger.

Start with the Developer Workshop

You know basic syntax and have gaps

Prerequisite: you have written a condition, loop, or function.

Outcome: build a working model of collections, exceptions, I/O, and OOP.

Open Programming Basics

You build backend services and want stronger systems knowledge

Prerequisite: you can build a small service on your own.

Outcome: connect HTTP, databases, testing, distributed systems, and operations.

Open the backend path

You need one topic

Prerequisite: you know the protocol, algorithm, or system area you need.

Outcome: reach definitions, boundaries, and engineering tradeoffs through the volume index.

Open the course catalog

Content status

The site has 14 volumes and 509 lessons per language. Depth and example verification vary by volume. Automated checks cover links, bilingual structure, and some code syntax; independent technical review of every article and execution of every example remain incomplete.

Read the readiness report · Understand the project scope