A very common mistake is to categorize painting, sculpture, etc., as art. Not necessarily so, I say. What about copying, sketching, etching, taking photos, and so on. Is the product of any creative activity art?
Take that rice bowl in my kitchen. Compare with that jade bowl in an art gallery. Is the bowl art because it is jade? Likely, but not necessarily, even though it may be priced many times more.
What makes a piece of art is that it transmits a sublime message beyond physical value, and beyond the reach of time. The message may be strong or weak, lasting or temporal, soothing or disturbing, benign or malevolent, beautiful or ugly, and so on. How? let me give you two bowls, one clay, and one jade. Hold each one in turn, and tell me the difference, not because you value jade more than clay, but because clay can be more art than jade.
Another common mistake is to take art to be fine, delicate, delicious, exquisite, and so on. Those were the days, when we would relegate pre-civilization scratching on rockface as barbarian past-time.