Is there any guide for BT4, which explains the usage of almost every tool in BT4 final?
Yes i have used google
Even though there aren't any specific guides to Backtrack though, there are still many guides for the individual tools provided by backtrack. I'd recommend searching for guides to the tools you plan on using the most, that's helped me in the past.
Tools - Offensive-security.com
This is for BT3 but a lot of the tools should match up.
Also the 'man' command.
check this blog
Information Security Tutorials
That's a great link Avatar. Thanks very much.
For a basic, petty, example, the early stuff about smtp connections could be sped up quite a bit by replacing "nc -v 192.168.1.5 25" with "nc -nv 192.168.1.5 25" to remove the DNS lookup.
The information available on that site is, at best, skiddie-friendly and should not be used for a decent basis to Backtrack tools.
Not that I have a better one, but just making the point known. If you really want to learn, fork out the weeks-wage worth for the offsec course. It's better written, explains more stuff, and is a lot easier to follow.
Still not underestimating the power...
There is no such thing as bad information - There is truth in the data, so you sift it all, even the crap stuff.