Yes, you have chosen the best answer.  It would be very nice of the meaning of the law, as found in legislation and case law, was always clear and easy to understand, but this is simply not the case.  For various reasons, the law, in its written form, is often capable of various interpretations, either as to its intent, nature or scope.  One reason is that language itself is often incapable of absolutely unambiguous expression.  Another is that the meaning of language may change over time.  And the circumstances in which laws were originally formulated may also change, giving rise to new questions.

For these reasons, it often happens that, after finding the most relevant law for a particular case, it is necessary to ‘interpret’ that law before applying it,  This means identifying any uncertainties of meaning and applying the appropriate techniques for resolving them.  You will learn about these techniques, both in relation to legislation and case law.  In addition to these techniques, you will also find that having a background knowledge of legal concepts and principles, and of similar cases that may have been decided in the past, is an invaluable aid to understanding particular rules of law and applying them appropriately.