A feed is a file made up of a list of products which use groupings of attributes that define each one of your products in a unique way. In the Google Merchant Center, all of your products will be added to a primary or a supplemental feed. Once you’ve created a feed, it can be added to any of the programs you’ve signed up for. To find more information on Google Shopping feeds go here.
Also, if you have not yet verified your store builder website on your Google Search Console, you'll need to do that before you are fully able to utilize the Google Merchant Center product feed benefits. Check out that tutorial here.
Check out the video below for a demonstration on how to set up your product feeds for Google Shopping.
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