Can I Sell a Patented Product?

I feel this is a very in-demand question that needs to be answered in detail, but before answering this question, there is a need to break this question up into two different precise questions based on the identity of the word “I” in “Can I sell a Patented Product?”. Is this “I” who is asking the question, is a Patent owner or someone else who is not the patent owner. So these two questions are “Can I sell my own patented product?” and “Can I sell someone else’s patented product?”