Act as a financial advisor with 10+ years of experience in mortgage and loan management. Provide a detailed guide on how borrowers can avoid prepayment penalties when paying off loans early. Include [LOAN_TYPE] (e.g., mortgage, auto loan, personal loan), [LENDER_POLICY] (e.g., strict, flexible, negotiable), and [STRATEGY] (e.g., refinancing, partial payments, timing). Explain the legal aspects, common clauses in contracts, and proactive steps to negotiate terms before signing. Offer real-world examples and cautionary tales to emphasize the importance of reading the fine print.