Here are a few that I love:
3 Blue 1 Brown: https://www.youtube.com/channel/UCYO_jab_esuFRV4b17AJtAw
VSauce: https://www.youtube.com/user/Vsauce
Numberphile: https://www.youtube.com/user/numberphile
3 Blue 1 Brown: https://www.youtube.com/channel/UCYO_jab_esuFRV4b17AJtAw
VSauce: https://www.youtube.com/user/Vsauce
Numberphile: https://www.youtube.com/user/numberphile
To understand what's going on here in any meaningful sense, the parent commenter should pick up an accessible undergrad textbook on abstract algebra. It doesn't have to be particularly advanced. Then they'll have a better foundation for understanding the algebraic features of various number systems.