Step-by-step guides for SQL, tools, and practical AI — skills you can use at work. Learn by doing, not by jargon.
🎓 Core Analytics & Data Skills
The foundational curriculum: go from messy spreadsheets to confident SQL, Python, charts, and metrics you reuse everywhere.
SQL series
Step-by-step SQL — from playground setup through joins, subqueries, and optimization.
- Parts 1–4: Playground setup, SELECT, filtering, and sorting
- Parts 5–8: Grouping, aggregates, multi-table joins & subqueries
- Parts 9–14: Views, indexes, window functions, CTEs & query tuning
🤖 Everyday AI for Work & Life
Practical AI workflows for knowledge workers — prompting, memory, personal assistants, and real work tasks.
Practical AI for analytics people
A nine-part series for analysts: what AI can and cannot do, tokens, prompts, evals, RAG, agents, privacy, documentation, and a personal ops checklist.
- Parts 1–3: Capabilities, limits, token economics & prompt framing
- Parts 4–6: RAG foundations, agents, evals & structured data extraction
- Parts 7–9: Privacy boundaries, governance checklists & production ops
🛠️ Major AI Platform Masterclasses
Deep-dive operational playbooks for frontier models and developer ecosystems with official marks.
Claude
Anthropic Claude from first login through product map, Claude Code, and Cowork — one continuous path.
- Parts 1–3: Prompt caching, Projects, Artifacts & context hygiene
- Parts 4–6: Claude Code CLI tool execution, subagents & workflows
- Parts 7–10: MCP server integration, tool boundaries & developer best practices
🧠 Open-Source & AI Engineering
Run, build, fine-tune, and inspect models locally — llama.cpp, Unsloth, RAG, vector databases, and autonomous harnesses.
Fine-tuning open models with Unsloth from scratch
A comprehensive, zero-fluff engineering guide to fine-tuning open foundation models using Unsloth. Understand the mechanics of weight updates versus prompt engineering and RAG, master manual CUDA autograd kernels that deliver 5x training speedups with 80% lower VRAM, explore LoRA and QLoRA low-rank adapter mathematics, prepare high-quality Alpaca and ShareGPT instruction datasets, fine-tune Llama 3 and Qwen models on free Google Colab GPUs, and export merged adapters directly to GGUF, Ollama, and vLLM for high-throughput production serving.
- Part 1: Weight updates vs RAG & prompt engineering trade-offs
- Part 2: 5x faster custom CUDA autograd kernels with 80% less VRAM
- Part 3: LoRA / QLoRA training on Colab GPUs & GGUF production export
🏢 Data Systems, Engineering & Applied Practice
How data moves, scales, and delivers value: pipelines, dbt, Airflow, stewardship, BI, and domain analytics.
How data actually moves
A seven-part series for analysts who inherit pipelines: path, latency, storage homes, orchestration, dbt concepts, environments, and observability.
- Parts 1–2: Trace data movement, lineage & latency requirements
- Parts 3–5: Storage tiers, orchestration engines & dbt transformations
- Parts 6–7: Multi-environment deployments & proactive observability alerts
Keys, IDs, and joining in plain English
Why customer_id beats matching on names. Primary keys, foreign keys, one-to-many joins, and sheet habits that keep IDs stable.
Chats, Projects, files, and Research
Part 4 of Learn Claude from scratch. When bare chat is enough, when a Project earns its keep, how files and Research fit, and a starter Project kit…
Grok app and web: first 30 minutes
Spend your first thirty minutes on Grok with a structured plan. Learn how to configure your account, verify real-time search queries, test the difference between Fun and Regular…
Web and mobile: first 30 minutes
Part 3 of Learn ChatGPT from scratch. A guided first half hour on chatgpt.com and mobile so you leave with one real output and a clear map of…
Claude on web and mobile: first 30 minutes
Part 3 of Learn Claude from scratch. A guided first half hour on claude.ai and mobile so you leave with one real output and a clear map of…
Tables, not freeform cells
Headers once, one value per cell, tidy vs wide. Turn pretty spreadsheet layouts into analysis tables that filter, join, and export without drama.
Grok.com, mobile apps, and Grok inside X
Looking to try Grok but confused by all the options? Learn the crucial differences between Grok.com, the X Premium integration, and the xAI Console. We break down the…
Free, Go, Plus, Pro, Business, Enterprise without hype
Free, Go, Plus, Pro, Business, and Enterprise differ mainly in capacity, features, and admin control, not in magic truth. This Part 2 explains each rung, why Go exists,…
When a spreadsheet becomes a liability
Spreadsheets start handy and can end as multiplayer systems of record with no owner. Learn the liability ladder, red flags, and Monday fixes before you trust a file…
Free vs Pro vs Max: what you actually get
Free, Pro, and Max differ mainly in usage capacity and paid tools, not in magic truth. This Part 2 explains limits, Pro extras, why the API Console is…
What Grok is (and xAI’s many AI names)
Confused by the difference between xAI, Grok, and the X platform? This plain-English guide breaks down exactly what Grok is, how the models evolved from Grok 2 to…
What ChatGPT is (plain English)
ChatGPT is OpenAI’s AI assistant family, not one single app. This Part 1 map separates company, models, and products so you can start on web, mobile, or desktop…











