The Moon, simply put, is the counter-reaction of all people. Think of how when the Sun sets, the Moon rises. The Sun begins an action and the Moon reacts to it. The Moon in astrology, in addition to controlling reactions, also controls basic habits, personal needs, and people’s unconscious.
The Sun is where the brunt of our personalities come from and is the reason why we act the way we do. For the most part, the Sun gives us masculine energy. The Sun even gives women a bit of masculine energy, but that is mostly hinting at the men in their lives. Every adult has an inner child and every child has an inner adult. This comes from the Sun too. The sun gives aid when we need to make a decision about something.