Probably dumb question but want to double confirm here.

Just want to confirm 100% when I'm buying a call option.

So all I do is "BUY OPEN" and "SELL CLOSE" for the call option.

Doing this will not cause me to lose money beyond what I put into buy the contract and premium right?

For example, if I "BUY OPEN" a call option for a stock at $20 for a price of $100 (including premium) and if the stock drops to $10 making my contract worthless, If I "SELL CLOSE" I only lose the $100 right?