Food Pictures

Dana from Minimalist Baker started a Food Photography School that is comprised of videos about everything from using a camera to composition and styling to photoshop and sharing your pictures through different social channels.

It is a $99 flat fee, but if you have lifetime access to the current videos and anything that is added.
https://foodphotographyschool.com/

Any basic photography course (doesn't have to be about food) will help you learn how to compose photos like a pro.

https://food52.com/blog/10516-james-ransom-s-5-essential-photography-tips
https://food52.com/blog/2761-food-photography-101
https://food52.com/blog/10243-7-questions-with-blogger-molly-yeh
https://food52.com/blog/11431-jen-altman-on-the-best-tricks-for-food-photography

There are a number of articles re: photography on this site. Do a search: "food photography" in Articles and you'll find many helpful tips.

I can't recall an article from Food52, but Serious Eats has a fantastic article on taking great food photos,

http://www.seriouseats.com/2015/03/beginners-guide-to-food-photography.html