Option trading strategies can be complex and diverse, catering to different risk tolerance levels and market conditions. Here's a summary of some popular option trading strategies:

1. Buying Call Options (Bullish Strategy): Investors buy call options when they anticipate the underlying stock's price will rise. Call options give the right, but not the obligation, to buy the underlying asset at a predetermined price (strike price) before expiration.
2. Buying Put Options (Bearish Strategy): Put options are bought when investors expect the underlying stock's price to fall. Put options provide the right, but not the obligation, to sell the underlying asset at a specified strike price before expiration.
3. Covered Call Writing (Neutral to Bullish Strategy): Investors hold a long position in a stock and sell a call option on the same stock. This strategy generates income through the option premium and is suitable for slightly bullish or neutral market outlooks.
4. Protective Put (Insurance Strategy): Investors buy a put option for an existing stock position. If the stock price falls, the put option provides downside protection. This strategy is akin to buying insurance against potential losses.
5. Collar Strategy (Protective Strategy): This strategy involves buying a protective put and selling a covered call simultaneously on the same stock. It limits both potential losses and gains, making it suitable for conservative investors.
6. Iron Condor (Neutral Strategy): This strategy involves selling an out-of-the-money call and put option while simultaneously buying a further out-of-the-money call and put option. It profits when the underlying asset's price remains within a certain range, making it ideal for stable, sideways markets.
7. Straddle (Volatility Strategy): Investors buy a call and a put option with the same strike price and expiration date. This strategy profits from significant price movements in the underlying asset, regardless of the direction, making it effective in highly volatile markets.
8. Strangle (Volatility Strategy): Similar to a straddle, but the call and put options have different strike prices. It's a strategy used when investors expect significant price volatility but are unsure about the direction of the movement.
9. Butterfly Spread (Low Volatility Strategy): Involves using three strike prices for options with the same expiration date. It profits from low volatility when the underlying asset's price doesn't move much. It's created by combining a bull spread and a bear spread.
10. Ratio Spread (Neutral to Bullish/Bearish Strategy): Involves selling a specific number of options and buying a larger number of different options on the same underlying stock. This strategy profits from significant price movements in either direction.

Remember that these strategies involve various levels of risk and complexity. It's crucial to thoroughly understand the risks and potential rewards before engaging in options trading and, if necessary, consult with a financial advisor.