One of the unfortunate results of the incredible resurgence of apologetics in Christianity in the last two decades is the impression many apologists give that an extensive study of philosophy is necessary to effectively defend the faith. On the contrary, what most Christians lack when it comes to apologetics is a robust grasp of Christian theology. Many believers try to defend Christianity with only a minimal understanding of their own faith.
On the other hand, a little knowledge of philosophy, logic (and worldviews, for that matter) can certainly help a believer catch contradictions in the thinking of an unbeliever, and in his own thinking, too. There are many excellent resources to help someone get started. Many online resources also have the advantage of being graphically oriented to speed comprehension and increase memorability.
Here are some of the best resources:
Do you know of any others? Comment to add other graphic resources on Philosophy, logic and worldviews.