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Structured, free learning paths for developers. Pick a track below — each lesson uses the same visual, scannable format with diagrams and practical examples.

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Learn JSON

49 lessons · ~12h · 7 sections

Master JSON from data types and syntax to APIs, security, and real-world patterns — with live validation and visual diagrams.

Start learning →JSON Tools

Learn SQL

14 lessons · ~3h · 1 sections

Go from zero to confident querying. Understand relational databases, tables, keys, and the SQL skills every developer needs.

Start learning →SQL Tools

JSON curriculum preview

The full JSON path includes 49 lessons across 7 sections. Open the JSON track from the sidebar or start with Introduction to JSON.