@Diogenes phil,
Free will is a complicated issue and there are plenty of arguments both for and against. Those in favor generally argue that we have the ability to make choices and that there is some element of unpredictability in the outcomes of those choices. On the other hand, those against often suggest that free will is an illusion, that we are predetermined to make certain decisions, and that our lives can be explained using determinism.
From what I understand, the main argument FOR free will is that it can explain how people make choices, while some argue AGAINST it based on the idea that everything is predetermined. Those FOR free will would say that human beings can make conscious decisions, whereas those AGAINST it would argue that whatever choices people make are predetermined, even if they are not aware of what is predetermined.