Why Medieval Era?

If possible I want to learn everything 

For me it’s mostly because I don’t like guns! 

This sound interesting in its own way. More of a man vs nature type story.
Jack of all trades, master of none 

∧＿∧
　("ಠ_ಠ) "I see...makes sense." 

It was called something else there but, yes. Damn I will share it to my friends! 

Tbh they do it because the it's easier to explain, for example, in science fiction it's in the future. So they gotta explain every new fangled gadget, and have more lore as foundations. Meanwhile in fantasy all they gotta is explain the magic system and how it balances with a sword system. 

It's gonna be like the lines from "The Lion King" where they literally say, "I have no idea who I'm saying!" 

Well, soon enough, someone's going to train so hard that even death no longer collects their soul. Consequently, making them The Enternal Almighty God Of The Heavens, and Infinite World in which we live in.