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Opportunity cost is the sacrifice made to gain something in return for example taking money out of a bank to buy a car the opportunity cost in this would be by using the money on the car you sacrifice the interest you gain from the bank. Actual cost means the cost incurred on something so by using the above example the actual cost would be the money spent on the car and nothing else. I hope this helps!

From micro economy point of view oc is the amount of the next best thing available.

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Opportunity cost is the value that you have to forgo in order to get the other. The theory is based on the assumption that resources are scares and you have to make a choice.