Hi can any body give all linux command and their usefull hints?

You're not going to learn that way, but heres a list of 687 commands:

[Only registered and activated users can see links]

You need a book, so have a look at your libarary, "Using Linux" by B Ball is one example, but there are many great books now, some in full colour.

Linux commands typed at the terminal, are normally in the BASH shell. There are other Shells, including C and Ash Shell. Depending on your distribution, BASH will probably be your shells environment.
HTH

I suggest you to learn required tools only. Go through [Only registered and activated users can see links] here you will find some server management tools like iptables, squid, qmail, apache, sendmail, authentication applications, DNS, etc. decide what you need most and go through its basics. you will be creating rules to manage service which ever you requires.

All d best...

Bhavik Patel,
India

other site try logon to [Only registered and activated users can see links]