Contract is a central topic in our common law legal system. In fact, many free-standing substantial legal topics in this website are contract-based [eg. landlord and tenant (commercial and residential), insurance, international trade]. It's most closely related to the civil causes of action of tort and restitution (which see).
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.