The book goes from basic quantum mechanics to phenomena and processes in the “real world” (Thermal, wet, dense etc).
The book covers most of the topics in elementary courses of introduction to QM and quantum chemistry, as well as some advanced topics (e.g., open quantum systems, charge and energy transport, etc)
The pedagogical attitude formulates much of the technical steps as questions/guided exercises.
Just reading these exercises already gives a flavor of the underlying proofs, for “easy” reading.
More rigorous students would probably want to actively solve the exercises or follow the