Psychic advisors aren't magicians or mind readers. They can't tell you what you ate for breakfast, what color your car is, and no... they can't pick winning lottery numbers. That's not how psychics work!
The word "psychic" is an umbrella term used to describe a wide range of abilities that are inexplicable by natural laws. Abilities such as mediumship, clairvoyance, and clairaudience are just a few examples. Psychics generally receiving information through hearing, feeling, tasting, smelling, or seeing, and are able to relay that information they receive back to the seeker to help answer questions. They pick up on energies and are able to use the details they receive to uncover and make sense of the larger picture for you. Here are some additional tips to help you set realistic expectations before a reading, and an article delving into more detail about how psychic ability works.
Check out this video to give you a sense of what to know before getting a psychic reading.