I've been an N900 adopter since launch and as an end user, I'm generally pleased with the device. However, when using apps that require tweaking, I've been unable to get a handle on X terminal. Command lines that devs supply to modify or correct program operations leave me at a standstill because they either don't work, or I have no way of opening files from the /home directory.

So can anybody give me a basics on X terminal so I can start to make a little more of my N900?