new to cyber security and have some questions

i know you probably get shit like this alot so sry about that. I was watching this series and was on video 4

https://www.youtube.com/watch?v=lZlqr2PFJIo. He said he was now doing internal testing but in the last 3 videos he was doing external. I have some questions about this. If you do not have a device connected to the internal network how do you get in. I heard something about proxing in but im not sure. Do you have to be internal to see the other computers and compromise them or can this be done externally. Any other video tutorial series are helpful as im pretty new. Thanks

Edit: sry I had to write this post quickly as i dont have much time right now

Touch here for the full post on Network Security Noblemen tumblr

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