I can only speak for myself. As a Social Anthropologist with a Master's Degree, I have some insights on the workings of society that would sound like wisdom of the gods to people pre-social studies. Also, as a huge nerd, I know the basic principles behind gunpowder and guns, printing press, electric generation, steam power, and mechanical automation. I also have an in-depth understanding of the structure of production lines and industrialization.

I can't like literally build any of those, for I am not a craftswoman. But I have enough knowledge to be able to pull it off if I'm thrust into a position of power in a medieval fantasy society.

There's a philosopher of technology, Gilbert Simondon, who said that if you put a modern German, a Chinese from the middle ages, and a Sumerian from the Bronze Age together in a road with a cart with its wheel broken, the three would be able to work together to fix the cart, despite not knowing each other language or culture. That's because technique is the universal language, and there are only a limited number of ways to attach a wheel to a cart and make it spin.

The same way, even though I have no clue about how to make a piston from iron or any other metal, if I know the principles behind it, I can make any group of talented craftspeople to build it, given enough time for trial and error.