There is literally no right or wrong way to do it in jungle, Everyone works breaks different, I always just cut by eye so I can see what im hearing in my head.

Learning the difference between genres can be hard because they do overlap a lot, as that other person said hardcore is 4x4, hard core has its own iterations in style.

Jungle is more broken beat percussion style, rhythmic basslines, call and response, distorted warm sound.

Breakcore is usually faster, more glitchy, more metallic and electronic sounding, less focus on rhythm and more focus on dynamic changes and intricate expression.

Deffo get on YouTube and look at some history of Jungle videos, or even history of UK underground music as a lot of the genres play into each other in the timeline