Wireshark filter techniques for a Newbie

Wireshark filter techniques for a Newbie

Where can i get examples to learn WIreshark filter techniques.
Link for examples and exercises was mentioned in the "Defensive Security Labs" from BT, but the link(http://home.insight.rr.com/procana ) doesnt work any more.

Could you give a new correct link or related subject.

google used

Wireshark tutorials and or filters can be found using google.
wireshark filters - Google Search