The current book presents a range of popularly used GARCH models for the use of S&P500 option valuation. Our illustration adopts a practical yet non ones' own numerical method, making it ideal for readers who are new to the option price valuation. Demonstrating how the option valuation can be improved by accommodating the time variation of underlying price volatility and Monte Carlo simulation, our methodology has a 'parsimonious' perspective, placing the practical merit in the option pricing procedure.