"Options, Futures, and Other Derivatives" (John Hull) is the definitive newbie handbook in quant finance. If you are interested in Quantitative Finance, you should understand this book, cover-to-cover.
"Principals of Corporate Finance" (Brealey & Myers) is the definitive newbie handbook for Corporate Finance, which is not the same subject as Quant Finance.
"Principals of Corporate Finance" (Brealey & Myers) is the definitive newbie handbook for Corporate Finance, which is not the same subject as Quant Finance.