This blog post perfectly summarizes my opinion on this book:

https://qntm.org/clean

The second part was sort of interesting, not because of the actual refactoring that was shown, but because I got to look at Martin's examples and think "hmm, how would've I done this?"

The rest of it was either obvious or bad advise, although I'll give credit where credit is due, the book is really well written.

The main lesson I learned is that Java sucks.