Modern Art

To be honest I am not a big fan of art, but after watching this series of videos it kind of changed my point of view towards art. The only artist that I have heard before was Picasso I did not know anything about Pollock or Warhol. These three artist are different from each other, but at the end they came out with the same idea of people seeing art a way of life, way of expression, and even personality. Picasso's art was all about women., his painting was dedicated to all women in general. What I do not get about Picasso's art is why he painted that ugly and he became famous I think he is unique of painting just women in a " ugly" way. Pollock he was an angry painter who threw all his stress, depression, in a piece of paper or grass drawing just lines. Pollock's art represented the way he was feeling about his bad attitude towards life and put his life into drinking heavily with out reason.Warhol thought that art was dead, but he still did it as part of life. Drawing the same picture many times was impressing I like it.
Questions:
1) Why did Picasso become famous with his "ugly" painting?
2)Why was the real reason that Pollock was an alcoholic?
3)How did Pollock become famous just of drawing angry lines?
4)Why did Picasso like to paint naked women?
5)Why did Warhol paint the same thing in a series?