Learning the notes required to play a chord is theory.
Putting your fingers on the frets and feeling the strings pressing into your hands is practice.
You can learn the chord, but until you merge that learning with practice you’ve really accomplished nothing.
The same goes for fundraising and communications. We can engage in the intellectual arguments of our craft. But until we practice it – write the appeal, make the pitch, feel what works and experience what doesn’t — we’re just theorists.