I am 75 and I have been painting and studying art for over 30 years and I DON’T understand JacksonPollock an Rothko.
I would recommend Camille Paglia’s beautiful book “Glittering Images” which tackles both Pollock and Modrian (but not Rothko). Aside from that, she also covers many other artists that are more accessible from the Book of Kells through Andy Warhol. The prints are absolutely beautiful and on fine paper. I bought mine for a buck on Amazon.