In the 20th century, artists tumbled from one theory to another: Fauvism, Cubism, Orphism, Abstractionism, Expressionism, New Objectivity, Surrealism, Minimalism, etc. It's enough to make your head spin, but it's not that hard to learn to tell these movements apart if you have a little guidance and abundant examples. Likewise, it's not that hard to recognize the masters of 20th century art after you've had a little exposure. You don't have to feel like an outsider. Now's the time to learn the difference between Picasso and Matisse, between Salvador Dalí and Rene Magritte.
Paris Museum of Modern Art
Art Movements of the 20th Century