While art & art history are often studied to some degree as part of art courses & history courses, it is beneficial to have a single course dedicated entirely to art history.
When art history is taken as its own course, it makes it easier to see how art evolved through the ages.
Gardner’s Art through the Ages provides a concise history of art that is used by many universities.
This edition covers art history in one volume.
Free powerpoints of lessons can often be found online.