Tutorials

The 4-step routine for resolving any Git merge conflict: read the markers, pick a side or merge by hand, mark resolved, commit. With VS Code screenshots.

21 JavaScript interview questions a senior dev actually asks in 2026: closures, event loop, hoisting, promises, this binding, with the answers and follow-ups.

The 11 Python dict methods you reach for daily: get, setdefault, update, items, pop, the merge operator, plus dict comprehension. With code for each.

12 Python list comprehension examples, from basic squares to nested-loop flattening, dict and set comprehensions, with the 3 places you should not use them.

Three ways to manage Python environments in 2026 (venv, uv, conda) and the one-line decision tree that picks the right one for your project.

GitHub Actions CI/CD tutorial: the minimum viable workflow, 5 patterns (matrix, cache, OIDC, environments, cron), and the 4 mistakes that burn CI minutes.

A real Docker Compose tutorial: Node.js + Postgres + Redis in one docker-compose.yml, with healthchecks, volumes, .env files, and the deploy path to prod.

TypeScript generics, learned from 7 real cases: typed API wrapper, Result type, useFetch hook, generic constraints, conditional types, and the 2 traps to avoid.

A real Python BeautifulSoup tutorial: scrape Hacker News front page in 60 lines, handle pagination, save to CSV, and the polite-scraping rules I follow.

How the JavaScript event loop works in plain words: call stack, web APIs, microtask vs macrotask queue, why setTimeout(0) is not zero, and what fires when.