1. Buying a call option is a power warehouse, which has the power to buy the target at a certain price at some time in the future; Selling a call option is an obligation warehouse, and it is only an obligation to buy the target at a certain price at some time in the future.

2. Buy call options to pay royalties, and sell call options to collect royalties.

3. Time value is likely to be included in the call option premium. If the price of the underlying asset remains unchanged, the maturity value disappears, which is unfavorable to the buyer; When selling a call option, if the underlying asset price remains unchanged, the maturity value disappears, which is beneficial to the seller.

Call option: Call option is also called call option, buyer option, call option, deferred option or "knock-in", which means that the option buyer has the right to buy a certain number of subject matter at the strike price within the validity period of the option contract. A call option is a contract that gives the contract holder (that is, the buyer) the right to buy a specific number of specific trading objects from the opponent at an agreed price.

Put option: refers to the right of the option buyer to sell goods or futures to the option seller at a certain price within a specified period of time, but does not undertake the obligation of selling. Put option is also called put option, put option and put option. In the transaction of put options, investors who buy put options are optimistic that the price will fall, so they buy put options; The seller of a put option expects the price to rise or not.

The essence of call option: the net income of call option is called the maturity value of call option, which is equal to the difference between the underlying asset price and the exercise price.

The profit and loss of call option refers to the surplus after deducting the option fee (option price) from the maturity value of call option.

The essence of put option: the net income from the execution of put option is called the maturity value of put option, which is equal to the difference between the execution price and the underlying asset price.

The profit and loss of put option refers to the surplus after deducting the option fee from the maturity value of put option.

The difference between the two: the party selling the call option gets a premium and bears unlimited risks (uncontrollable risks);

The "put option" party pays the premium, but only bears a limited risk (if the price rises, the right cannot be exercised, and only the premium is lost).