Learn

Guided learning paths

Topic tracks that tie concepts, references, tools, and a hands-on task together — a route through the toolkit, not just a list.

Web security basics

Understand the browser's security model, then harden a response end to end.

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Concepts

Same-Origin Policy (SOP)CORS (Cross-Origin Resource Sharing)CSRF (Cross-Site Request Forgery)CSP (Content Security Policy)Nonce

Reference

Network securityHTTP headers

Practice

CSP builderCertificate decoder

Hands-on

Harden a web response

Designing an API

From idempotency and rate limits to validating an OpenAPI contract.

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Concepts

IdempotentRate LimitingWebhookIdempotency Key

Reference

OpenAPI & RESTHTTP headers

Practice

OpenAPI / JSON Schema validatorcurl to codeJSON to TypeScript

Hands-on

Prepare an API contract

Auth & tokens

Sessions vs tokens, JWT, OAuth scopes, and refresh — and how to debug them.

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Concepts

JWT (JSON Web Token)OAuth ScopeSession vs Token (Auth)Refresh TokenCSRF (Cross-Site Request Forgery)

Reference

OAuth 2.0 & OIDC

Practice

JWT parserJWT signer / verifierOTP (TOTP) generator

Hands-on

Debug JWT auth

Crypto basics

Hashing vs encryption, salts, HMAC, and checksums — what to use when.

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Concepts

HashingEncryptionSaltNonceHMACChecksum

Practice

Hash textHMAC generatorText encryptionBcrypt

Thai dev essentials

Validate a Thai ID, work in the Buddhist era, spell baht, and make a PromptPay QR.

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Practice

Thai national ID validatorBuddhist Era ↔ GregorianThai Baht to wordsPromptPay QR generator

Hands-on

Issue a Thai invoice

Ship & operate

Package, deploy, and run services in production — containers, pipelines, IaC, and safe rollouts.

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Concepts

CI/CDContainerizationContainer OrchestrationInfrastructure as Code (IaC)ObservabilityBlue-Green DeploymentCanary ReleaseHorizontal vs Vertical Scaling

Reference

DockerkubectlGitHub ActionsTerraformLinux admin

Practice

docker run → docker-composeCrontab describerChmod calculator

Hands-on

Containerize & schedule a service

Databases

Model, query, and scale data — ACID, indexes, isolation levels, and SQL vs NoSQL.

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Concepts

ACID (Atomicity, Consistency, Isolation, Durability)Database IndexNormalization (Database Normalization)Transaction Isolation (Isolation Levels)N+1 Query ProblemConnection PoolingReplication (Primary–Replica)SQL vs NoSQL

Reference

SQLPostgreSQLRedis

Practice

SQL prettify

Web performance

Make pages fast — Core Web Vitals, lazy loading, code-splitting, and caching.

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Concepts

Core Web Vitals (LCP, INP, CLS)Lazy LoadingCode-SplittingTree-ShakingCaching Strategies (Cache-Aside, Read-Through, Write-Through, Write-Back)Prefetching (Resource Hints)Virtualization (Windowing)ProfilingCache-ControlCDN (Content Delivery Network)

Reference

HTTP headers

Practice

Benchmark builderChronometer

Hands-on

Time and benchmark a task

Testing

Build confidence — the test pyramid, test doubles, coverage, TDD, and taming flaky tests.

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Concepts

Test PyramidTest DoubleCode CoverageTDD (Test-Driven Development)Flaky TestSnapshot TestingProperty-Based TestingRegression Test

Reference

Testing strategy

Hands-on

Review code and data