Contract is a central topic in our common law legal system. Many free-standing substantial legal topics in this website are contract-based [eg. business topics such as insurance, franchise and sale of goods), landlord and tenant (both commercial and residential), employment, private international law and more]. It's most closely related to the civil causes of action of tort and restitution (which see at the sidebar).
For website planning purposes, all proclaimed statutes (both Ontario and Federal) are 'home-located' with a single topic, the below statutes are the 'home statutes' for the Contract topic.