Here is a YouTube video about Martin Dudok van Heel PA1SDR Passive Radar at home, and is part of a growing collection of videos I have found to be useful. The reason is demonstration of how passive radar works and effective with modest sdr and dsp code and understanding science related to software defined radio.
This tutorial, "Martin Dudok van Heel PA1SDR Passive Radar at home" is free education you can watch, which will help you deepen your knowledge and be better prepared for licence exams, schoolwork, or operating radio equipment.