This video explains SWR, how to calculate it - and should we worry about it?
https://youtu.be/b9UUClfItrs - 7 Different Antennas
https://youtu.be/2sJkPpaNseE - Tune Any Antenna
Link to paper: https://www.iz2uuf.net/wp/index.php/2016/01/30/the-myth-of-swr-causing-coax-radiation