The understandings of orthodoxy, and orthopraxy are applied to philosophies, and religions. All practices usually have some form of orthodoxy, and orthopraxy in them, but usually they will fall into one of these two groups depending upon what they choose to focus on more.
Orthodoxy means correct belief. Ortho meaning correct, or straight, and doxy meaning dogma, or doctrine. Orthodoxy is about holding the established dogma of a religion, or philosophy, and it holds an importance on belief. Abrahamic, and organized religions are known to have a higher focus on orthodoxy though this will change from sect to sect. The opposite of this understanding is heterodoxy, or unorthodoxy.
Orthopraxy means correct practice. Ortho meaning correct, or straight, and praxy meaning practice, or action. Orthopraxy is about practicing the philosophy, or religion in the established way, and because of this these understandings are more concerned with what you do rather than what you believe. Paganism, reconstructionist religions, and folk religions are known to have a higher focus on orthopraxy though this will change from understanding to understanding.