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Wireshark basics
Wireshark shows you the network’s actual traffic, frame by frame: the single most convincing teacher in this curriculum. The skill is not capturing (one click) but filtering: narrowing thousands of frames to the one conversation that matters, then reading it like a transcript.
Your first exercise: capture your own laptop loading a page, and find the DNS query, the TCP handshake, and the TLS hello, everything the earlier tracks promised you was there.