Ice spear Totem build

Hi, i don't play poe often and most of the time just for fun. I came across this video: https://www.youtube.com/watch?v=Nesa7lisRyo&ab_channel=%EB%9D%BC%EB%A9%B4RAMYEONPOE

I love this build but I don't know enough about it. Could someone nice explain to me what I need to do to have an identical build? thanks

https://www.youtube.com/watch?v=oXzoNrdgz_k
Mathil did something similar recently