I know how it works but i have no idea how to do it so pls help me

Hello, I wanted to start speedrunning minecraft and I saw this trick called triangulation, I know how it works with the eyes directions but how to use it because i only found videos about how it works, so how do I find the cords with it?

Hello, I wanna start speedrunning minecraft and I saw that people use CaffeineMC and I'm not sure what it is, can anyone send me a download link to it? (also I found nothing in the internet)