“Structure” refers to the processes by which people work, both individually and as part of an organization (e.g., operating principles, policies, document templates, recurring meetings, etc.).
Unfortunately, structure is often viewed as useless overhead because it reminds people of red tape/bureaucracy.
Instead, having the right kind of structure in place eliminates overhead, letting you spend the majority of your time doing the work rather than thinking about how to do it.
This maximizes the value you get out of your time, which, in turn, allows you to move faster and more deliberately (see Ordinary actions create extraordinary results).
You can think of creating structure as giving up some of your freedom, which is precisely what makes freedom acquire value.