As I'm answering questions, I've seen instances where a paid product (such as a book, screencast, etc) might help the poster further improve their original problem. Is it acceptable to recommend that product and provide a link to it?
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If you have used a particular product to solve a problem, it is ok to mention that in your answer, while also explaining how it is used to solve the problem.
It is not ok to link to a product or site in all your answers, or if the link is the whole answer. Especially not if it is your product or site.