Math would be pretty useful for basically everything, including stuff as innocuous as the arabic numeral system. My lack of immunity to ancient diseases, modem diseases, and lack of language skills would be much less so.
I know maths. Kinda. I can't teach theoretical physics or anything, but I reckon I can get some basic principles down. Also, an understanding of astronomy, to really encourage people to keep moving forward.
You would die as soon as you ate or drank anything. Due to hygiene and food processing, food (and especially drinking water) has a lot less bacteria in it now than it did then. Your immune system would be completely unable to cope with it and you would get incredibly sick. Since medicine at the time involved "slap a leech on him" you're pretty much screwed at that point. Alternative: die of the plague.
Pedantry aside: assuming you somehow have the resources and adequate work space available to you, steam power would be the simplest to implement and popularize. Perhaps create a basic electrical system using water and wind power (both of which were commonly used anyways in the form of windmills and water wheels, so you have starting points). Maybe invent the printing press a few hundred years early. Of course once you invent these things you need a system to actually spread the inventions into society...
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