I have a light beard, and i've been shaving it with just water. is it okay? nothing bad has happened so far. what's the difference compared to creams?

Do as yo wish: The need for creams/soaps is variable depending on your beard type and skin sensitivity. Skin that is moist from water or sweat of a workout may shave easily with minimal or no irritation. Over time you may find the need to alter your pattern as your skin or beard changes. It is all up to your personal needs ans satisfaction with the outcome.