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
Apache Airflow tutorial: build your first data pipeline (DAG)
Orchestration is a ticket rail, not a junk drawer. Learn what an Airflow DAG is, how tasks and dependencies map to real runbook stations, and how to sketch…
How to organize the files in a dbt project so your team can find things
A messy dbt repo ages fast. Map staging, intermediate, and marts with clear naming and one grain per model so the project scales past your first three tables…
Power BI for beginners: build the data model before the charts
Power BI starts with the model, not the chart. Learn star schemas, relationships, and grain so your first report answers a real question instead of fighting double counts…
The analyst career ladder: what each level means if you don’t manage people
Analyst titles vary wildly. Part 1 of Analyst career path translates the IC ladder into plain English: execute, own slices, multi-team work, and senior bets, with signals you…
How to design accessible charts that everyone can read
Color-only charts exclude real users. This Part 1 of Inclusive data products covers labels, contrast, patterns, alt text, and a practical A11y checklist you can run before a…
