An interpretation found elsewhere: At #0, the Fool is the card of infinite possibilities. The bag on the staff indicates that he has all he needs to do or be anything he wants, he has only to stop and unpack. He is on his way to a brand new beginning. But the card carries a little bark of warning as well. Stop daydreaming and fantasizing and watch your step, lest you fall and end up looking the fool.
My interpretation: This is a card of new beginnings. The seeker has unlimited potential and the power to shape their destiny, but also needs to be aware of their surroundings, both physical and situational.