Hello,
I have a friend who is very knowledgeable in programming and hacking. He says the majority of his hacking ventures have been to data mine servers for information. I was wondering what this and and how it works. He said what he mainly does is monitor net traffic of the target, and when it updates, he gets information from server. I have tried asking but he says its incredibly "dangerous" hacking because its hard and easy to get caught? i dont know but any ideas would help

Thx,

Morpheous