Canada exports a variety of goods to the world market. A good chunk of that is semi-processed materials like metal ores, zinc ingots, coils of rolled steel, sheets of aluminum, lumber and plywood, crude oil and "syncrude" (a liquefied form of bitumen), natural gas, agricultural livestock and its products, grains, legumes, fruits and vegetables, processed products from the seafood industry, and so forth.
For many years high quality lumber, plywood, and composite wood beams were a major export item from the Province of British Columbia (BC). In terms of market value though, it was long rumored that (illicit) products from the cannabis plant, commonly known as pot were BC's true major export item. Of course, if the laws on pot use are going to change as widely anticipated, both in Canada and the U.S., it may indeed become an official export item for BC.