Aaron Francis is a Texas-based developer and educator who runs Try Hard Studios and is best known in the PHP / Laravel community for his deep production-database content. His videos and courses focus on the parts of working software that don't get attention from the framework documentation: SQL performance, database internals, and the realities of running databases at scale.
His CourseFlix listing reflects that focus — three database courses (High Performance SQLite, Mastering Postgres, MySQL for Developers) plus two on screencasting craft (Screencasting.com and Screenflow for Screencasters) covering the workflow he uses to produce the database material itself. The database courses are unusually rigorous for the YouTube-tutorial market: each one runs many hours and treats the database as a first-class object of study, not a black box behind an ORM.