Data Foundations
Learn data by doing. Understand how databases work, practice SQL, and explore how real products structure their data.
Relational Databases
What are tables, rows, columns, and keys? An introduction to how databases organize data.
💬SQL Practice
Write real SQL against a database. Progressive challenges from basic SELECTs to multi-table JOINs.
🗺️Schema Design
See how real products structure their data. Explore ERD diagrams for payments, e-commerce, messaging, and more.