This article explains the basics of contract law, including the validity of a contract, acceptance, revocation, consideration, and invitation to treat. It also includes relevant case laws such as Entoreas v Miles Far East Corp 1995, Adams v Lindsell [1818] 1 B & Ald 681, Dickinson v Dodds [1876] 2 ch 463 (B223), Errington v Errington [1952] 1 AII ER 149, Fisher v Bell[1961] 1 QB 394, and Stevenson v McLean [1880] 5 QBD 346.