All Articles & Tutorials
Explore practical guides, step-by-step masterclasses, and foundational definitions across AI, SQL, and data systems — written in plain, human English.
All articles
How to clean up missing values and wrong column types in pandas
Nulls, empty strings, and bad dtypes break joins and totals in quiet ways. Learn safe pandas casting with coerce, careful fill versus drop, and a symptom-to-fix table you…
Useful things to do with ChatGPT in your first week
Part 1 of the ChatGPT everyday tutorial: a Mon-Fri week in plain Chat with write, plan, and learn buckets. One real deliverable per day, worked prompts, and no…
Which Claude model to use: Haiku, Sonnet, Opus, or Fable
Part 5 of the Claude product map: pick Haiku, Sonnet, Opus, or Fable without FOMO. Start on the default, upgrade only when a clear prompt still fails, and…
Joins and merges in plain English
Learn how pandas merges map to SQL joins, when row counts explode, and how to check keys with validate and indicator. A customers-and-orders walkthrough keeps grain honest before…
When do you need the ChatGPT API instead of a ChatGPT subscription?
A ChatGPT plan is for a person typing; the API is for a program, with its own account and bill. Follow one team-chat bot idea from a free…
