Dry = not sweet. Not bitter - bitter is bad - but just not sweet. Body = thickness, aka mouthfeel, aka strength of flavor and texture. (I’m simplifying here.)

Dry = not sweet. Not bitter - bitter is bad - but just not sweet. Body = thickness, aka mouthfeel, aka strength of flavor and texture. (I’m simplifying here.) Mature = complex. Simple wines that can be opened while young are usually straightforward in the same way that soda is sweet.