CodeDev knowledge system / 28 chapters
DOCUMENT
DOCUMENT
THE WHOLE
SYSTEM.
A practical reference for programming, DSA, frameworks, databases, APIs, Linux, networking, testing, security, deployment, and the architecture behind CodeDev itself.
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01 / Start here
Beginner → advanced
Developer learning roadmap
A practical order for learning programming, DSA, web development, databases, systems, testing, and production deployment.
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02 / Start here
Beginner
Programming fundamentals
The core ideas shared by nearly every programming language: data, control flow, functions, scope, errors, files, and program structure.
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03 / Languages
Beginner → intermediate
JavaScript for modern applications
JavaScript fundamentals, DOM events, modules, async/await, fetch, validation, and browser security boundaries.
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04 / Languages
Intermediate
Kotlin and Android fundamentals
Kotlin syntax, null safety, coroutines, Android architecture, state, storage, networking, and lifecycle-aware code.
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05 / Web + frameworks
Intermediate
HTTP, REST APIs, and backend design
Requests, responses, status codes, JSON APIs, validation, idempotency, pagination, authentication, and API boundaries.
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06 / Data + backend
Intermediate → advanced
Backend architecture and data integrity
Service boundaries, validation, transactions, migrations, concurrency, caching, and designing state changes that remain correct under failure.
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07 / Systems + delivery
Intermediate
Linux, networking, and Docker
Linux service basics, permissions, ports, IP addressing, sockets, reverse proxies, containers, and deployment troubleshooting.
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08 / Systems + delivery
Intermediate → advanced
Application security essentials
Authentication, authorization, password hashing, MFA, CSRF, XSS, CSP, rate limiting, secrets, uploads, and secure production defaults.
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Production referenceHOW CODEDEV