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Explore practical guides, step-by-step masterclasses, and foundational definitions across AI, SQL, and data systems — written in plain, human English.
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Should you use Claude chat, Claude Cowork, or Claude Code for your job?
Chat, Claude Code, and Claude Cowork share a model family but not a job. Part 1 of the Claude Cowork tutorial separates conversation from software work from office…
How to automate data validation checks so bad data never reaches your reports
Automated checks catch bad data before leadership does. Build small scripts for row counts, referential integrity, freshness, and yesterday versus last week sanity so every number you ship…
How to use skills and scheduled tasks in ChatGPT Codex safely, one at a time
Skills, tasks, and scheduled help in ChatGPT Codex are power-ups, not day-one defaults. Climb a complexity ladder, hedge product renames, and never leave high-stakes deploys unattended.
Team habits that keep AI coding tools like Claude Code safe
Part 10 closes the Claude Code tutorial with team rails: shared CLAUDE.md and skills, required PRs and green CI, secrets policy, no silent prod deploys from agents, and…
How to handle dates, time zones, and fiscal calendars in your reports
Time zones and fiscal calendars quietly break dashboards people trust. Learn to store UTC, display local time, separate calendar months from fiscal periods, and cast dates safely in…
