This document discusses several key concepts regarding contract capacity and validity, including: 1) Minors can disaffirm (void) contracts, with exceptions for necessities and misrepresentation of age. Intoxicated persons may lack capacity depending on impairment level. 2) Contracts must be legal and not require illegal, tortious or against public policy acts. Illegal contracts are void. 3) Fraud, mistake, duress or undue influence can make contracts voidable or invalid. The statute of frauds requires certain long-term or high-value contracts to be written.