pbterm provides a Unix shell command-line interface. If you're familiar with Unix shells, then pbterm is very easy and nice to use. If not, then you have to learn the basics of using a Unix shell first. It's not hard, but you do have to learn what the various common shell commands are, and how to use them. There are various resources online that help with that.
If you want to play around with a shell first, you can log into your device using ssh instead of sftp when the sshd server is running (see the pb_sshd README file). Unfortunately, because of unsolvable problems with permissions, the terminal you get using ssh is very basic. You don't get a command-line prompt, or a command history, nor can you use an editor within it. You have to type every command afresh at the blank line. To log out, just type "exit" in the terminal.
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