If you are talking about SEO for a particular product. Here are the best things that worked for me.
If you are using WordPress when uploading a picture of the product make sure the filename matches the product name, write a correct alt tag description and use WordPress to describe what the product is about in the definition section of the image when you upload it. I have done this for a hardware store and they started ranking for the images themselves along with the product names.
Another thing that worked well for me was to include the part number in the title, alt tag, and description of the product. This has worked well for me on a site that sold Milwaukee Tools. Many people searched for part numbers of the Milwaukee Tools products. People optimize for the product but neglect optimizing for the part numbers. By doing this my customer sold a lot of tools.