Read the Following Passage: The invention of the printing press by Johannes Gutenberg in the 1400s changed the world forever. Before the press, books had to be copied by hand, which took a long time and was very expensive. The printing press allowed books to be produced quickly and in large numbers. As a result, more people were able to buy books, learn to read, and share new ideas across different countries. This invention helped spread knowledge to everyone, not just the wealthy. What is the main idea of this passage?