I'm New and There Is a Problem.

Hello everybody, first of all my english is not very good :D

But that's not the problem. I wanted to start to learn "How to hack like a Pro: Linux Basics for an aspiring hacker" but i'm on Kali Linux and this tutorial is on BackTrack. So when it says "do this command ..." I do it but it's not the same thing in Kali Linux so it doesn't work and I can't learn :(