I'm considering learning penetration testing. I'm told tat Kali Linux is the tool of choice. I've never worked with Linux, other than a single time that i helped a client who has Ubuntu. And that was a long time ago and I don't remember what his issue was. Do I need to learn Linux before I start using Kali, or is it fairly straight forward? I don't mean is knowing Pen Testing straight forward. I'm trying to determine the starting point. Kali or Linux?