Correspondence schools are an alternative for studies for those not keen going the traditional way of studying. Charles Schulz attended one in his youth. Perhaps he was the most successful artist to come out of such correspondence schools after the war.
“Schulz said that his routine every morning consisted of first eating a jelly donut, and then going through the day’s mail with his secretary before sitting down to write and draw the day’s strip at his studio. After coming up with an idea (which he said could take anywhere from a few minutes to a few hours), he began drawing it, which took about an hour for dailies and three hours for Sunday strips. Unlike many other successful cartoonists, Schulz never used assistants in producing the strip; he refused to hire an inker or letterer, saying that “it would be equivalent to a golfer hiring a man to make his putts for him…”