> but does it really bring any information about what exactly am I doing by generating keys, creating users? The keys are used by ShellHub as "ssh host keys" t

> but does it really bring any information about what exactly am I doing by generating keys, creating users? The keys are used by ShellHub as "ssh host keys" that ensures you are connecting to the right server. The users that are created by 'add-user' script are used to login in the Web UI running on port 80. > How is it really an improvement over let's say VPN The improvement is that you don't need to run your own VPN server and setup the client on every host :) > Maybe a simple image/scheme would help to understand all the hierarchy and what exactly is happening where? I fully agree with you