1. what was ed ruscha art technique 2.what was Robert Indiana's art technique and idea
3. what was Roy lichttension art technique and idea

1. Ruscha became well known in the late 1950s when he began making small collages using images and words taken from everyday sources such as advertisements. This interest in the everyday led to him using the cityscape of his adopted hometown Los Angeles – a source of inspiration he has returned to again and again.

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3. Roy Lichtenstein (1923-1997) was an American Pop artist best known for a signature style that borrows from mass culture, particularly comic books and advertising. Lichtenstein's technique, which often involved the use of stencils, sought to bring the look and feel of commercial printing processes to his work.

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I don't know the second one