Gutenburg's printing press was such an important invention, because before he invented it, people would either write stuff all by hand, or make some stamping system. If Gutenburg hadn't invented the printing press, we wouldn't have printers to print things out!
Extra:
Gutenburg designed the printing press in a town called Strasbourg, France. he built the actual thing in Mainz, Germany.
Answer:
The answer is 1,3, and 4. I hope this was helpful!
Well, the chinese big secret was silk. So that would be my best guess.
