what is your opinion on/about/of

[Over the top]

Hello
Which one is correct
What is your opinion on/about/of my story/essay?
Thanks

[Rover_KE]

What is your opinion of my story?

Rover

[Barb_D]

The preposition with "opinion" is difficult.

I can have an opinion on something -- it would be my viewpoint.
I can have an opinion of something -- it would be whether I think it is good or bad.

What is your opinion of my essay? It's good!
What is your opinion on abortion? I think it's between a woman, her God, her partner, and her doctor -- but not the government.

{Please, I just used this as an example. No comments on abortion are sought or welcome.}