The Dada movement claimed to be anti-art; it had a strong negative & destructive element. Rejecting all tradition, they sought complete freedom. Dada quickly spread from Zurich to other European cities. Dada artists claimed to have invented photomontage.
There a number of techniques which are incorporated into this aspect of Art. There are also various apps and workshops that can be used to create the photomontage including Paint, Photoshop and other Digital imaging websites.
Perhaps the most famous and controversial Dada artwork of all was Marcel Duchamp’s Fountain. It consisted only of a urinal set on its back, but it raised a powerful question: “What exactly is worthy to be called art?