Copywork is a discipline used to teach people how to write. For centuries, copywork was how we taught children to write well.
So, hows it work?
Simple: you copy, using your own handwriting, other writers' work. In doing so, you learn the texture, pattern, and habits of great writing.
You don't learn a new musical instrument by writing your own songs. You learn other people's songs. Then, after mastering and finding what you like, you develop your own voice using the patterns you noticed in copying others.
This is exactly how copywork helps you become a better writer.
It’s the same secret George Orwell, Roald Dahl, and Ben Franklin used to sharpen their pens. They didn’t just 'study' the greats - they hand-copied them until the brilliance stuck.