https://freecourse.fr/courses/relativistic-quantum-field-theory-i/lessons/lecture-20-maxwell-theory-and-its-canonical-quantization/
Lecture 20: Maxwell Theory and its Canonical Quantization - freecourse
Credit: MIT OpenCourseWare (YouTube/UC_U5-ma_ADOFs9b2I0g_C5Q )
maxwell theorycanonical quantizationlecture