Greeks are sensitivities of derivative prices to all factors on which they depend (underlying price, maturity, volatility, risk free rate):
Derivatives are mainly used to hedge certain risks. Greeks indicate the inverse of the derivative quantity needed to optimally hedge targeted risks. For example, the purchase of 20 puts with a delta of -0.50, will hedge (against underlying movements) a long position of 10 underlying stocks.
Growth Investing focuses on stocks whose sales and/or earnings are expected to increase above the market or industry average rates. Typically, Growth stocks show low Dividend Yield and/or high valuation ratios (Price to Earnings Ratio…).