There are two different kinds of apologetics – positive apologetics and negative apologetics. Both can be
valuable ways of defending our faith.
We use positive apologetics when we explain the advantages of our faith, when we tell what God has done for us. It is essential when we share our faith in a positive way to have a common starting ground. This is what Paul did when he was in Athens in Acts 17. He saw the various idols and statues representing the various gods, then he saw one inscribed “to the unknown god.” He started here and began to tell the Athenians of the one true God, the one they honor as the unknown god. He made Him known to them.
We use negative apologetics in two ways. We may respond to an attack against our faith. Someone may say something to the effect of “how can you believe that?” or they may reject God, or they may attack God or some element of your faith. You may explain to them why you believe it. That is an example of using negative apologetics.
Another way to use negative apologetics is when you attack a position that they might believe. For example, if they believe that morality is a personal issue, and that there should be no absolute moral authority, rather leaving it up to each individual, than you can point out where that line of thinking may lead someone. If my idea of morality is up to me, than what is to say that I am going to treat others respectfully, or that I am going to keep the common good in mind. It becomes a free for all, with everybody doing what they want, at the expense of everybody else. There has to be some minimum limit defining what is right or wrong.
As you share your faith, you will have the opportunity to defend your faith. When you do, you are practicing apologetics.