Books suck (imho). We need a new format to teach and learn this deep technical stuff. Not youtube, something interactive with exercises and engagement.
It's a wild world where "reading the documentation" or "researching a topic" has become a career superpower. I'm glad my education largely predated social media and cell phones, and that I learned to read and work problems independently. OTOH it often makes work a very lonely, taxing experience. Being a human index into documentation is a hell of a lot less fulfilling than working with people who also can read.
I urge you to rethink this perspective. All research shows that paper increases comprehension significantly over screens and even over eink. Additionally hand note taking again has a positive impact.
Books have exercises. It's your job to engage.
This book, in particular, has 3 pages of Problems per chapter. The only way to learn the math is to do all of them.