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Delta neutral trading strategies . There are many ways . One way is to bid-ask spread , can profit from time decay . Do you think it will lose more time value than the options you buy , you can sell options .

Another way is to buy and sell based on their option delta. These industries are called delta neutral trade. Delta neutral trading options trading all the options the total increment is zero . 

Option Delta 50 .

If you buy a mobile phone money, you will have a delta +50 .

Money if you sell a call option , you will have a delta -50 .

If you buy an investment fund , you will have a delta -50 .

If you sell the money to invest , you will have a delta +50 .

Basically, Delta will be the market you want to go . Think of it like this: If you sell a call option , where you want to move it to market ? You want it to go low . So, you will have a delta -50 .