First take a look at this page to get an overview of what dirctories Puppy has and what are they for: File Structure
Here are some common commands. Yyou can enter them in rxvt, see it's icon on your desktop: cd dir_name
Change directory pwd dir_name
Print working directory mkdir dir_name
Make directory rmdir dir_name
Remove directory cp file1 file2
Copy file find
Find a file
Some commands need something else to get them to work: an argument. Some commands, like mkdir (used to create directories), work with only one argument, as in mkdir directory_name. Others, like cp (to copy files), require multiple arguments.
Many programs that comes with puppy can be run from the command line too. For example, typing leafpad will open puppy's text editor