Educational resources to understand the options market.
Free tools to view stock, ETF and option quotes, implied volatality, theoretical prices and all the Greeks.
Free analytical tool lets you see potential gain/losses over time.
Before I enter a position I always know my maximum loss. My markets are mainly USA, Germany and Japan. I always have a Currency-Hedge and a Beta-Hedge or Protective Puts for my open positions. I trade both long and short.