A book of this age (21 in 2023) gets judged differently than newer ones: how did it predict/shape the years/decades since its printing? In this case, fairly well. The Professional Learning Community has become ubiquitous in usage, though at different levels and with different results depending on the school. But the language used shows how influential the concept has become.
Getting Started is very practical and easy to understand. This isn't a college-level, ivory-tower think piece which inundates you with statistics and psychological studies or government-level fixes that could only be changed by electing different politicians who appoint new bureaucrats to blow up the system and replace it with a new, ideal one. It focuses on makeup and personal responsibility - how to set up the community and who should take ownership of the results. It's a great read for someone transitioning to a leadership position in a school or as a refresher to make sure the community hasn't become stale and stagnant. Hopefully you'll find your school has been doing these things for years but you can always find small ways to improve.