SQLBolt provides free interactive SQL tutorials with immediate feedback in browser-based exercise environment. Completely free with no account required. The platform covers SQL fundamentals through 20+ lessons: SELECT queries, filtering, joins, aggregations, subqueries, and database modification. Each lesson includes explanation followed by exercises where users write and execute SQL against sample databases. Progressive difficulty builds from basic SELECT to complex analytical queries. No AI features—traditional tutorial format with predefined exercises and answers. The simplicity and zero-barrier access makes it popular for absolute beginners. Limitations include limited advanced topics, no real-world datasets, and no personalization. Best used as starting point before more comprehensive platforms. For comparison: SQLBolt is tutorial-focused while platforms like DataCamp offer career tracks and practice environments. Page should cover: lesson curriculum outline, exercise format demonstration, limitations for advanced topics, comparison with DataCamp and other learning platforms, and recommended learning path (SQLBolt as foundation, then advanced platforms).