My hard drive space is almost all used up. What is the first thing I should do to free up some space? Would deleting photos help or should I un-install some things. For example I have NFPA 2002 NEC code changes installed on hard drive among other items that take up much space.
One other unrelated question...Where can I find online definitions of terms such as router, modem, hub etc.

Thanks,
Frank Ciner