Thank you all so much for all the details and help.
So if i may clarify something .
All i would have to do is sell the call option and the difference between the stock price and the strike price is how much i would make or lose?
So for ex: APPL is trading at 100 and the strike price is 103. I buy 1 contract for 10 usd . If AAPL moved to 105 and I sell my option would that mean I make 200-30= 70 usd ?
200 is the correct gross profit. Not sure where you got 30 from, and 200-30 is 170... I assume the missing 1 is a typo. Anyway, here is truth:
Assuming 100 shares per contract:
Premium: $10
Contract open fee: $3
Sell price: 105
Strike price: 103
Contract close fee: $1.50
Price diff: 105-103=$2
Maths:
Price diff * contract size = gross profit
(105 - 103) * 100 = $200
gross profit - premium - open fee - close fee = net profit
$200 - $10 - $3 - $1.50= $186.50 net profit
Note that if the price went below the strike; say, to 96, you lose only the premiums you paid plus fees; you DON'T lose the 100-96=$4 share = $400 price diff. Specifically, you'd lose $14.50 if you sell at 96. If the contract were to expire at this price, you'd lose $13. Paying to close when it's worthless is irrational; you just let it expire.
Also, it might help you to know that with some brokers you can actually EXERCISE the option contract; that is, pay the $103/share, worth $10,300, when the market price is $105, worth $10,500. Then the actual shares are added to your portfolio.
Taxes are outside the scope of this thread, but expect to pay 20-40% in taxes, depending... which I choose not to think about as much as possible. At a 30% tax rate your take is 186.50 - 55.95 = 130.55.
Death and taxes, my friend.