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Connect two routers using wireless!

I am following this advice here. I have not managed to setup the secondary router yet.
I don't see how what configuration here actually connects you to the primary router. I WPA-Personal on the primary router that is why I used the same on...

Mechanics of ssh into server [closed]

I have a server created on a server hosting platform and can ssh into it but I don't understand the mechanics behind it.
When I want to ssh into something it normally has to either be on my same router or have a vpn connection to access it...