Meetings is likely the one activity that takes a significant portion of your time apart from your own tasks.
This section will not cover the aspects related to scheduling external or team meetings since some of it has already been address in the Protect your schedule and Review your commitments chapters of the Plan section.
In short, remember to take into account your energy level throughout the day so as to schedule your meetings according to your preferences. In my case, I prefer to pack meetings in the afternoon and use my mornings for deep work sessions.
Likewise, whenever you receive an invitation to a meeting, do not hesitate to ask for more information about its purpose or even to decline if the previous ones were not well prepared.