>>17864088 (OP)The only useful skill you can have is if you are doing something traditional, like carpentry, masonry, tailoring, smithing, fencing and such things people practiced back then. But this kinda sucks because you are just going to be a normalfag serf like everybody else.
I think the best thing anybody could do is becoming a fool/storyteller, wandering around as the man from the future telling tales about people flying, taming the elements, creating light by pressing a button, wars that involved the entire world, the far away places that hadnt been discovered yet and the wonders of the internet. People wouldnt take you very seriously, but there wasnt that much entertainment available so you could probably make a good living out of it, telling your stories at the tavern as people laugh and call you a fool. Of course depending on where and when you end up you need to tone down a few aspects, e.g. if you are in medieval Europe do not tell people everybody is an atheists and God doesnt exist or you are gonna get that tongue cut out. And dont tell the Romans that the Barbarians will surpass them in every way or you are getting your ass beat and sold off on some market.
You also shouldnt use your knowledge to speak prohpecsies. You may be blamed for something like Constantinople falling and get your ass beat, or people may start believing you and then every pleb and every noble in the lands will demand you tell them their future so good luck with that.
But if you do get a hold of nobility then you would make a great court advisor/jester. Even with a rudimentary understanding of modern economics, sociology and psychology(!) you will be far ahead of everybody back then, so you could add a completely different kind of thinking to the table which a wise ruler would appreciate.
And as a court jester you are set for life really.
So your greatest asset would be your modern way of thinking, but at the same time it would be the greatest danger to you.