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You are presumably happy with the Black Scholes formula for the option price.
However, whatever the variables and therefore the option price are today, tomorrow each of the variables (share price, time to expiry, etc) might be different and therefore the option price will be different as well.
Theta etc measure the rate of change in the option price as each of the variables changes.
E.g. if the if the time to expiry changes by 10% maybe the option price changes by 2% – the rate of change would be 2/10.For an explanation of which each of them is measuring see page 66 of the free Lecture Notes (and watch the lecture that goes with it where I say the easy way of remembering which is which). Note that the only one of the 5 that you can be expected to actually calculate is Delta (N(d1).
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