If the stock hits the strike price and they want to buy the stocks - do you have to do anything or does your stock just get sold?
If you sold a call and it gets 'assigned' (expires in the money) the brokerage will typically liquidate your position within 1 business day. You don't have to take any actions.
Also, there are American and European 'style' options that have slightly different rules on expiration and assignment. Read more about the SEC rules on options here: https://www.investor.gov/introducti...alerts/alerts-bulletins/investor-bulletins-63