Uniform Commercial Code (UCC): Primary law governing sales of goods in the US, particularly Article 2. Covers contract formation, performance, and remedies. Mandatory for goods transactions over $500.

Statute of Frauds: Legal requirement that certain contracts must be in writing to be enforceable, particularly relevant for sales of goods over $500 and real estate transactions.

State-Specific Contract Laws: Various state-level requirements affecting contract formation, enforceability, and consumer protection that vary by jurisdiction.

Fair Trade Practices Laws: Including Federal Trade Commission Act and state consumer protection laws, governing fair business practices and preventing fraud.

Product-Specific Regulations: Specialized regulations that may apply depending on the product type, including FDA regulations, Consumer Product Safety Commission requirements, and industry-specific rules.

Property Laws: State property laws, local zoning regulations, and real estate transfer requirements applicable when the sale involves real property.

Electronic Signature Laws: E-SIGN Act and Uniform Electronic Transactions Act (UETA) governing the validity and enforceability of electronic signatures and records.

Tax Considerations: Various tax implications including sales tax requirements, property transfer taxes, and federal tax considerations that must be addressed in the agreement.