Although it helps to know at least a little of the historical & philosophical context of Voltaire's slim work, it still drives its point home pretty well. We will never have all the answers that we seek. So is the world we live in, with all its good & suffusive evil still the best of all possible worlds? Or is it the worst due to the free will of humanity succumbing to boredom, vice, & need?
Who cares? You have a garden to cultivate. Get to it.