It's a pretty decent introduction to operating systems, but it has several inaccuracies, so although it's pretty informative, I suggest trust but verify with it's information. I.E. when talking about the different types of interfaces, it mentions GUI (graphical user interfaces) and CUI (command user interfaces). The proper term for command interfaces is CLI (Command Line Interfaces). Also, when the hardware chart is offered for various ports on the PC, it claims that 37B through 37F is the parallel port. This is incorrect, 378 is the address for the first parallel port. (or at least it was on every pc I've ever owned, though a quick check of wikipedia seems to indicate the book is correct, and 378 was LPT2 which defaulted to LPT1 if the one at 37B didn't exist, odd).
Regardless, there are other shortcomings. This book was published (supposedly) in 2017, yet the IOS and linux histories end in 2005, while the microsoft chapter goes all the way to 2015. Android gets a mention, but only up to version 4.1.
The linux shell is simply called shell, instead of bash, and various other minor details are used incorrectly, or left out entirely.
Still, as an overall lesson in operating systems, it's not a bad primer, as it hits all the major points and covers most needed information, but I wouldn't rely on it as an absolute source when verifying detailed information about topics covered here.