How does one write (or me telling the story of how I've learned writing)

School assignments

Well of course, you have the obvious assignments
You know, those where your teacher gives you a document with a passage from a book and they tell you "Go ahead, imagine how the story goes afterwards"
Yeah, I was pretty good at those, lot of imagination as a kid.

I remember, in 4th grade I'm pretty sure, the teacher had given us a text to work on conjugaison, the teacher just went and told us "imagine the rest and write it with that one verbal tense"
For some context, the text was about some kid that was in the jungle and in my sequel (i guess-) the kid casually got attacked by a tiger.
This was one of my first stories with mild gore and fighting scene, like the kid was hurt to the point of hiding in a tree with a sharp rock and wait for an opportunity to attack the tiger without getting killed. I never got the chance to finish the story cause the class ended and the teacher took our notebooks to correct our texts (I'm still salty about it after 7 years-).

I can write gore now but I still have no idea of how to write fighting scenes lmao-
Well I didn't really read fighting scenes until I started reading Warriors but that's for another chapter-