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Discover LudwigThe phrase "a topic on" is correct and usable in written English.
It can be used when introducing a subject or theme that will be discussed or explored further.
Example: "The professor gave a lecture on a topic on climate change and its impact on global ecosystems."
Alternatives: "a subject regarding" or "a theme about".
Exact(58)
Ms. Napolitano's departure would leave a void in Arizona, a caldron of resentments and fear and thick-headed immigration politics — a topic on which she has long been one of the cooler voices in the state.
Bullying was also a topic on Sunday.
Obviously, this isn't a topic on which D's and R's are going to agree.
By contrast, birtherism was a topic on which Clinton was notably focussed and clear.
She has a horror of being replaceable, a topic on which she is forensically honest.
THE Great Rotation is a topic on the minds of strategists on Wall Street.
Immigration is now a topic on the French school curriculum, and the museum trains 2,000 teachers each year.
They posted a topic on the Guardian Bike Blog asking what they should do for their hack.
But this is hardly a topic on which Merkel can be suspected of ignorance, or carelessly sensational assessments.
It turned out to be much more engaging than introducing a topic on mini-beasts and sticking to 'the plan'.
Similar(1)
This study examines the effect of goal instructions on students' reasoning and argumentation in an interactive context (discussing a topic on-line).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com