Why "on" is used not "of"?
Technically, you can use "of" as well. However, it does not sound as natural as using the "on" or "about." This is because "on" and "about" are usually used to introduce the topic or theme of something, which is what the speaker is doing in this video. He is stating that he is tempted by the idea of making videos on the theme of food photography, which is why he has used "on" instead. Ex: I wrote a book on French baking techniques. Ex: The documentary is about the Great Coral Reef.
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