How moving charges create magnetic fields and how time-varying fields lead to electromagnetic waves.
Since EMFT is a highly visual subject (thinking in 3D), the clear illustrations help in visualizing field lines and orientations.
Comprehensive Guide to Electromagnetic Field Theory by A. Dhananjayan
A cornerstone for calculating fields in symmetrical charge distributions.
Grad (Gradient), Div (Divergence), and Curl.
This section deals with stationary charges. Key highlights include: