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 build a customer funnel that matches how your product delivers value
Generic marketing funnels hide the step that actually matters in your product. Part 1 of Customer analytics basics maps Visit to Pay stages to real events so activation…
How to design A/B tests that lead to good decisions, beyond the p-value
p < 0.05 is not a product strategy. Experiment design beyond the p-value covers hypotheses, ethics, rollouts, and decisions that survive contact with real teams. Part 1 of…
Sampling and bias for analysts
Your sample is not “the data.” It is a story about who showed up, who got filtered out, and what bias you baked into the chart. Part 1…
What is Gemini? Google’s many AI names, explained
Gemini is Google’s AI assistant family, not one button. Part 1 separates company, models, and products, translates old names like Bard and Duet AI, and maps the app,…
How to set up a Custom GPT’s instructions, knowledge files, and actions
Part 2 of the Custom GPTs tutorial. Structure instructions (role, audience, steps, format, refuse, example), version knowledge files without secrets, and treat actions as a later, higher-risk layer.
