$Invesco QQQ Trust(QQQ)$ 

First of all, picking expiration date of an option involves considering various factors such as your trading strategy, market conditions, and the underlying asset's volatility.

Understand your trading strategy: Determine your objectives, risk tolerance, and the duration of time you intend to hold the position. Different trading strategies equire different expiration dates. For example, day traders may prefer options with shorter expiration dates, while long-term investors may opt for options with longer expiration dates.

Evaluate the underlying asset: Assess the volatility and expected price movement of the underlying asset. Highly volatile assets may require shorter expiration dates to capture price fluctuations, while stable assets may be better suited for longer-term options.

Consider upcoming events or catalysts: Take note of any significant events or announcements that could impact the price of the underlying asset. For example, if a company is scheduled to release its earnings report, it might be wise to avoid options that expire before the announcement, as the stock price could experience significant volatility.

Review historical price patterns: Analyze the historical price movements of the underlying asset to identify any recurring patterns or trends. This information can help you determine the optimal duration for your option contract.

Assess liquidity: Check the liquidity of options contracts with different expiration dates. Options with higher liquidity tend to have tighter bid-ask spreads and better execution prices.

Strike price selection: Once you have determined an expiration date, you also need to select an appropriate strike price. Strike price selection is intertwined with expiration date selection, as they both affect the cost and potential profitability of the option. The strike price should align with your price expectations for the underlying asset.

I hope the above example are able to help to understand more for choosing the expiration date of an option. Remember, options trading involves risks, and selecting the right expiration date is just one aspect of the overall decision-making process. It's important to conduct thorough research and analysis before making any trading decisions.

Here are some examples i choose for Selling Put option and Selling Call option for longer term period to earn the premium.