I know thats some list command, but as I am a Linux noob, what exactly do they do?
And yes, but you will have to wait until tomorrow morning, as I am in bed now *g*
lsusb lists all the USB items connected to your Pi. The command filters the output through grep, which searches for the word "hub". This gives me a count of how many logical hubs your Pi is seeing.
The second command, with -t, asks the Pi to give a tree listing of the hubs. That shows how the logical hubs are connected to each other. The output includes every USB device connected, which might show that some logical hubs are in fact empty on your system.
You can find out more about lsusb by using the man ("manual", as in instruction manual) command:
man lsusb