No Stupid Questions

I could probably discover electricity, depending on where I landed. Jewelers of the time could make wire, copper was common, and magnets (lodestones) had been discovered. Realistically though I'd be a dumb giant (ie, speak no known languages of the time and statistically I'd have like a foot on the "tall" people of the era). I'd probably try to find some party trick that looked like magic to people of the era then hope that people would welcome and try to integrate me rather than burning me as a witch. Then I'd probably die in a week or two anyway to some disease lol

If I snapped you back in time 650 years

2025 - 650 =1375

Its the 12th century

1375 is the 14th century. Which do you mean?

Answering the actual question, nothing good would come of it if my location on earth didn't change. Being the only white person in rural northern Japan well before Europeans came in the 1500s would probably not be a good situation for me. The language, at least the written one, was very different. Being the Nanboku-chō era, things would probably be not great since it was in the midst of 60ish years of war with two different people claiming to be in charge. I can't find, at least before my coffee kicks in, exactly what kinda state Mutsu Province, as it was then called, was in at the time.

Wash my hands

I'd use my knowledge of the future to do two chicks at the same time

What place do I get teleported to? If I'm teleported to the same place on Earth, then I just fell down several meters into a swamp and am probably going to die here.

As an Australian I would struggle significantly unless you were to also transport me geographically.

I would teach London children the most obnoxious brain rot slang from today as a laugh.

I know thousands of songs. Also, musical instruments like the saxaphone haven't been invented yet.

Well, I would give you the answer, but since I snapped back as soon as I read the post, I'm now responding what has been 650 years later for me, and I'm too fucking old for this shit a second time. I bypassed getting snapped back this time by just not reading the post and coming straight in to comment.

Now, what will happen if I read the

I'll probably die of dysentery. Just because I know modern hygiene rules doesn't mean I'll survive interacting with all the other people who don't but are used to local bacteria and viruses.

I'd probably be dead in no time for a long list of reasons

First of all, nobisy would be able to understand me, as even current English would be barely recognizable by them

Then there is the issue that I'm probably at least a foot taller than most people and let's just say that "being even remotely different" back then was a good reason to be killed

Then there is the food issue. Food was scarce (hence most people being quite a bit shorter than me) so it'd be hard to keep myself fed. Clean water? Hah, good luck with that.

Then there is the issue of diseases. I probably carry shit that their bodies won't be able to handle, si being around me will likely make people sick, which in turn will get me labeled as a witch which would get me tortured and burned. Similarly but conversely, loads of diseases that were rampant back then are now gone, and likely my body is less equipped to handle that, I'd die from some disease

Ignoring all of that...

I'd probably start spreading the knowledge of democracy, and the harms of religion, and how important it is to immediately kill kings or king wannabes. I'd make a library with a vast wealth of knowledge and give access to the first country that successfully transforms itself to a representative atheist democracy with laws in place to ensure that no king, fascist, or wannabe will ever be able to rise up again.

That country would become the dominant world power within decades, spreading democracy and science over the world.

I would warn the Native Americans about the Europeans

Assuming I am physically in the same place, I will fall to my death. If I somehow survive the fall I would be severely injured and alone in the wilderness. Within a few days I would probably die of either my injuries, dehydration, or hypothermia.

Wouldn't I be in like empty space?

I'd kill your ancestors.

Die as you forgot to teleport me to where the earth was at the time.

Otherwise I guess my main knowledge that could be useful is some basic first aid. Secondary to that, a little bit of electrical stuff.