Tutorials

Twenty-seven interactive visualizations of coding interview patterns — two pointers, sliding windows, DP, monotonic stacks, union-find.

Twenty-six system design problems — URL shortener, rate limiter, distributed cache, chat system, RAG pipeline, and more.

Twelve OOD visualizations — GoF patterns, UML diagrams, LRU cache, parking lot, shopping cart, API design, refactoring.

Nine analytics visualizations — SQL window functions, funnel analysis, cohort retention, A/B testing, product metrics.

Fifteen core CS concepts — bloom filters, back-of-envelope, geohashing, load balancers, concurrency, OS scheduling, networking, auth.

Twenty-nine visualizations on how LLMs work — tokenization, attention, KV cache, quantization, speculative decoding.

Twenty-six visualizations on running models locally — GGUF format, CPU SIMD, VRAM math, Ollama/LM Studio, MLX, ComfyUI, Flux, LTX-Video, Kokoro TTS, Whisper.

Twenty visualizations on engineering Small Language Models (under 5B) for edge & domain deployment — scaling laws, vocab budgeting, DoRA, DPO/KTO, grammar masking, GGUF quant, speculative drafting, MLX/Mobile runtimes.

Interactive architecture visualizers for 45 models across 27 types — Qwen3, Gemma 4, DeepSeek V4, Hy3, Kimi K2, Phi-4, Nemotron. Click any node to drill into subgraphs.

Thirty visualizations — slotted pages, B-trees, MVCC, ARIES recovery, sharding, two-phase commit, caching strategies.

Thirty-two visualizations — CAP, Raft, CRDTs, gossip, distributed locking, consistency models, architectural patterns.

Twenty-nine visualizations — Linux namespaces, overlay FS, Kubernetes, Helm, Vault, observability, data pipelines, CDN.

Twenty-seven visualizations — arrays, hash tables, red-black trees, graph algorithms, dynamic programming, Big-O cheatsheet.

Twenty-nine visualizations — sorting, caching, compression, cryptography, probabilistic sketching.

Ten interactive visualizations — observability fundamentals, OpenTelemetry, distributed tracing, Prometheus, Loki, Grafana, and OpenObserve (S3-native).

Embeddings, ANN search, indexing strategies — plus 21 Qdrant tutorials from getting started to GraphRAG.

Data model, CPython internals, asyncio, PyTorch, LangChain, FastAPI & FastMCP — 55 runnable bundles.

Value/pointer semantics, GMP scheduler, concurrency, context, production patterns — 52 bundles.

Ownership, borrow checker, async/tokio, axum & sqlx — 50 bundles + 26 walkthroughs.

Structural types, event loop, zod, Hono & Drizzle — 52 bundles + 22 walkthroughs.

RAII, move semantics, templates, UB, concurrency & the memory model — 51 bundles + 18 walkthroughs.

HTML/CSS, box model, Tailwind 4, React, Astro vs TanStack Start — 37 interactive bundles.

Hooks mastery, compound components, concurrent React, animations, TanStack Router — 36 interactive bundles with React 19 + Tailwind v4.

Container queries, variant ecosystem, arbitrary values, oklch color, animations, build pipeline — 38 interactive bundles.

A concept-builder curriculum walking RFC 0001 — from a pnpm/Vite scaffold to a Google-Vids-class scene-based HTML-slide video editor. 16 verified, gold-checked bundles.

Grammar, vocabulary & usage visualizations — interactive exercises recomputed live.

The repo overview, structure, and how everything fits together.