An 850 credit score offers the lowest mortgage rates, saving significant money over the loan's life. It's crucial to understand mortgage rates, the minimum credit score for loans, the types of mortgage loans available, and the factors that affect mortgage rates. Several types of loans such as conventional, FHA, jumbo, VA, and USDA are discussed, each with unique requirements. A high credit score like 850 typically leads to lower interest rates, but other factors like down payment, loan term, and existing debts also influence rates.