How Wi-Fi Works — SSID, Association, WPA2/WPA3, CSMA/CA & Channels
See exactly how Wi-Fi (802.11) works: the AP beaconing an SSID, the client associating, the WPA2/WPA3 security handshake, CSMA/CA sharing the air, the 2.4/5/6 GHz bands and channels, and roaming between APs. Interactive, plain-English, free.