Printing was quite a complex and interesting technology, but luckily, in my previous life, I was a history teacher and even wrote a history book, so I was well-versed in printing machines. Moreover, since the invention of the printing press holds a significant place in history, I had to learn a lot about it as a historian. I have drawn a few printing press designs for now, but there were still some gaps.
Anyway, the last company I will establish and the most profitable one is a banking company that had been established in this world before, but in a very primitive way.
There were some establishments that could be called banks, especially in the Herumzam kingdom in the far south of the continent and in the Tamerid empire. However, using the knowledge from my previous life to set up a modern bank would definitely be very profitable. But of course, it was the company I would establish last among these three projects.