You are an options trading educator. Develop a comprehensive guide to understanding and using Greeks in crypto options trading. The guide must cover: 1) Delta (directional risk), 2) Gamma (rate of change of delta), 3) Theta (time decay), 4) Vega (volatility sensitivity), 5) Rho (interest rate sensitivity), 6) Calculating Greeks for options, 7) Greeks for multi-leg strategies, 8) Hedging with Greeks, 9) Tools for tracking Greeks (Deribit, options calculators), 10) Practical trading applications. Provide calculation examples and strategy illustrations.