Why publishers of his books are not publishing in some ebook platforms at least some of them like "to mock mocking bird" or I fail to find it on amazon kindle or google ebooks
Also try this material I mean aforementioned blog by Bartosz Milewski and go through it but do it really SLOWLY and then things start to make sense and in all honesty there is no easy way to mathematics in general
If that would be that easy but if you want really easy introduction to category theory then check a book "how to bake a pie" by Eugenia Cheng have a good read
I only hope it doesnt push them even more to destroying thinkpad brand although there are some encouraging signs as shown in the release thinkpad p info