This is the taoist principle of "non-action".
It should not be confused with inertia or passivity, but understood as not forcing,
going with the grain /pattern of nature. (Li).
It is exemplified in the japanese arts of judo and aikido
where an opponent is defeated by the force of his own attack.
Wu-wei is the taoist lifestyle,
a spontaneous form of both conscious and unconscious intelligence
along the lines of least resistance.
By its nature, it cannot be strived for /cultivated, and is non-streaming,
outside time (since all experience is only now)
....you and the things you go along with are all the same process.
There is nothing to do, or not to do, about this.
Wu-wei is therefore intuitive, and can only be "learned" by indirect pointing,
often through question & answer sessions (zen -koan) with a teacher.
The taoist meditates for the joy of it,
rather than to foster wu-wei (which is rather a by-product than an objective).