With these few key skills in hand, you're ready to start exploring your Unix system. In doing so, you can quickly get an idea of what's available and gain some useful experience in entering commands.
Think of your Unix system as being a thoroughly kid-proofed house: You can look around and touch some stuff, but you can't do anything to hurt yourself or the system. So, don't worry! You can't hurt anything by looking around, and even if you tried to break something, most Unix systems are configured well enough that you couldn't.
Table 1.1 shows some of the directories you're likely to find most interesting or useful (Appendix B of this book provides a more comprehensive list of directories). You can use the following steps to get started exploring.
To explore locally installed programs: