Hello chen.yo, welcome to LQ,
the most common commands which are valid on every Linux-distribution are
which shows and changes the networksettings, read the manpage for ifconfig.
shows the state of your wireless-adapters.
The command "man -k" and "apropos" (which is the same) are a very good starting point when you are searching for system-specific information. Note that the program you are using when you read a manpage is "less". Look at the manpage for less. less has the same keybindings as the vi editor which makes it very convenient to navigate in a manpage. "j" is one line down, "k" is one line up, "1G" is the first line of the manpage, "G" is the last line of the manpage. Searching is done via "/", example
will search for the next occurance of the word "ip-adress", with "n" you search downwards.
Note further that near the bottom of every manpage (remember the "G" command) there is a section "see also" which leads you to related manpages.
For your second question I don't know, I've at least never seen such a thing.