Hello AO

Well my company wants me to learn Cisco routers and they gave me a PIX 501 firewall router and i understand how to get into the router and some basic commands like:

enable = administration mode
disable = user mode
configure = enter into configuration mode
terminal = terminal mode
memory = memory mode

and other well known commands like:
help or ?

what im looking for is other commands that can help me in configuring the router so that I can support this router for our customers.

Can you add some commands and explain alittle about what that command does. Thank you.