Wireshark is a popular network analyzer tool that captures packet data. It uses pcap to capture packets and has an easy-to-use GUI. When capturing packets in Wireshark, you should close unnecessary applications and select the interface address. You can filter the capture by IP address or port number. After capturing, you can analyze streams in the conversations tab and follow streams to see content. Filters can then be applied to remove empty or single-flow packets. When filtering, you should ensure the starting IP is correct and remove unrelated advertisements and images while keeping the host count below 30.