This document discusses key concepts related to contracts, including consideration, breach of contract, contingent contracts, contracts of indemnity, and contracts of guarantee. Some key points: 1. Consideration is something of value given in exchange for a promise. It can be past, present or future acts and must be desired by the promisor. 2. Breach of contract occurs when a party fails to fulfill their contractual obligations. This can be an actual or anticipatory breach. 3. A contingent contract is one whose performance depends on an uncertain future event. If the event occurs or does not occur, the contract is enforced or voided accordingly.