Hello Robby! A store is a place where you can buy things (example: Walmart, JUSCO, or the grocery store). Storage is a place where you keep things, usually in a building (you should google "storage unit" if you want to see an example or an image). Did this help?

In addition to what Ryan said, "store" as a noun can mean a supply of things. Example: "He has a large store of food ready for the long winter." "Storage" as a noun can also refer to the AMOUNT of space you have to store things, such as having plenty of closets in your house/apartment. Example: "My apartment does not have enough storage, so I have lots of things stacked up in boxes in the living room."

Store is a place to buy different products. Storage is where you keep your own items, normally separate from your house. It's a place for extra things, normally.