write on *
write of
write about **

To write well of the West there is so much one should know.

Years later he wrote of his time in the camp.

She wrote little in the last twenty years of her life.

He'd had to write far too many of these letters, and they never came easy.

If he tried to write of his experiences, the result would be the same.

I can write, of course it's not easy, and have a lot to say, but who is going to read it?

"The most beautiful girl in the world," she wrote of Blue.

The most important thing about Shakespeare was what he wrote, of course.

"Everything about me was wrong," she wrote of her experience at a new junior high school.

He writes of the poor as though all, or most, are black.