I don’t think you should feel obligated to learn apologetics, nor do you need to engage in debates with atheists.
Still, if it interests you, you could study the classical philosophers and their arguments. Ultimately, the one thing many “common/pop” atheists shrug off is that they take their epistemology and ontology for granted, if they even think about it at all, without even considering the intellectual consequences of doing so. For someone to state that reality is intelligible (maybe not to our brains, but still intelligible in itself) and that everything must be proven and presented as evidence, but then fail to appreciate that as the metaphysical assumption they’re making and the implications… (don’t get me wrong, I agree 100% that reality is intelligible and such, but it’s the very fact that it is intelligible that leads to knowledge of God, and to deny that, as a consequence (not spelling it all out here) leads to an irrational, unintelligible universe, in which case insisting that everything must be presented with evidence becomes contradictory). Ultimately, an intelligible reality in which evidence can be presented and rational arguments can be made requires an unmoved mover, prime mover, necessary being… an ultimate reality that is the foundation and wellspring of all existence, which is what we call God.
You can’t just say that to an atheist though and expect to win a debate. You’d have to study and “practice” making the arguments. And if that’s not of interest to you, you shouldn’t feel compelled to learn it. You don’t need to know those things to be a good Catholic. And of course the blunt statements made above by me are really over simplifying the situation and a bit polemical themselves.
And to be fair, some atheists are not themselves moved by pursuit of rational arguments, but may find themselves led to Christ for far more personal, emotional, loving, or simply spiritual reasons in hearing the gospel. So everything I said above is not the only road to go. People have different interests.