welcome to LQ!
If you Google "Linux commands" you should quickly come across a number of good sites where all the common (and some not as common) Linux "words" or commands, are described. If there's no detailed description, then the man pages as suggested by an earlier poster, is the place to learn the usage of the commands.
I'm not sure if Puppy includes a full manpage set, but the Linux manpages are also available online-- I haven't got a link handy, but Google can take you there.
All the best,