Terminal Advice For A Beginner

Hey guys,
I have some questions about using the Terminal and I'd be grateful for any help.
Firstly I was wondering if there's any way which I can find out what programmes are available to me in Terminal?
Secondly are there any websites that'll give me info on the Terminal? Like a guide that suggests things to do in Terminal? I don't want to edit files or anything, just to use some of the functions available in Terminal.
Is there anything interesting that I can do with Telnet? The best thing I've found so far is an ascii animated Star Wars thing..... Can you connect to chatrooms or anything with Telnet?

Firstly I was wondering if there's any way which I can find out what programmes are available to me in Terminal?
ls /bin
ls /sbin
ls /usr/bin
ls /usr/sbin
then use *man command_name* to find out more about the command.
Another approach is to use *apropos keyword* and if whatever you specified as the keyword is found in the man one-liner, it will tell you the man page(s) that match your keyword. For example *apropos search* will show a lot of commands that have some relation to search. The sections marked 2 or 3 are programming sections. Most commands are in sections 1 and 8. This is just a guideline, not a hard and fast rule.
You might see if you can find the "Learning Unix on Mac OS X Tiger", or a book on bash (perhaps even the *bash cookbook* which will show you useful things to do with bash.
Do you know anything about my Telnet questions?
Unless you explicitly need telnet, I would suggest using ssh to login to remote systems. Much more secure and as far as I'm concerned has more features, such as scp, sftp, tunnels, *SOCKS Proxy*, passwordless logins, remote command execution, scripitablility, etc....
But if you need telnet because of some telnet feature, then use what you need to use.

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