The best suggestion to get a core review of the basic concepts as starter, and that Dave from the EEVblog [1] recommended several times, is the section Fundamen

The best suggestion to get a core review of the basic concepts as starter, and that Dave from the EEVblog [1] recommended several times, is the section Fundamentals of Radio Electronics from [2] - "The Arrl Handbook for Radio Communications" . Plus you get all the other stuff around Radio. It will cover all the basics. Old ones can be found on the intertubes. It is now a classical. Even used 2015 versions go for $300 dollars or more. [1] https://www.youtube.com/@EEVblog/playlists https://www.youtube.com/@EEVblog/playlists {2] https://www.arrl.org/arrl-handbook-2023 https://www.arrl.org/arrl-handbook-2023