Here is a YouTube video about Basics of IQ Signals and IQ modulation and demodulation, and is part of a growing collection of videos I have found to be useful. The reason is understanding what iq signals are, plus how to create them and manipulate them digitally and understanding science related to software defined radio.
This tutorial, "Basics of IQ Signals and IQ modulation and demodulation" 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.