I will paraphrase and answer the simple searches on Backtrack 4 here.
(Maybe I will write some larger articles on some of the bigger subjects later.)
Where are the password dictionaries in Backtrack 4?
There are a few million, right out of the box. Here are some to start with.
How do you update metasploit?
Just type "msfupdate"
How do you fix a broken metasploit?
This seems to be a very common problem. I already did a post on this here:
How do you install a decent FTP server on Backtrack?
Install vsftpd using apt-get
apt-get -y install vsftpd
(Type "man vsftpd" for more info)
How do you revert iptables?
To list the iptables rules
To clear the iptables rules
To save the iptables rules
iptables-save > blah.txt
To restore the iptables rules
Where has Wireshark gone in Backtrack 4 R2?
Indeed, a good question. I asked this very same question to one of the developers, and got a short answer, but hey...
It used to be in the "Internet" folder, but it disappeared from there. However, you can run it from the command-line by typing "wireshark".
Now that you've got your feet wet with Wireshark from the command line, you may want to try some cool command line parameters, like this for example:
wireshark -i eth0 -f "host 192.168.1.254 and tcp port 80" -k
This starts Wireshark, sets up a filter, specifies the capture interface, and starts a capture all in one go. Which I find quicker and more repeatable than running the same from the UI.
If any of this helps you, please give me some feedback below. If there are other simple things you want know, you could also leave question. I check and respond to comments.