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“Incognito” in the browser DOES NOT MEAN invisible. WhatsApp on PC? https://web.whatsapp.com By the way, WhatsApp / Web only works if your phone is online. Public Wi-Fi is dangerous. Mobile data is better. Deleting doesn't always mean gone. Don't forget to empty the trash. A USB stick wears out – yes, really. Router login usually accessible at 192.168.0.1 or 192.168.1.1. Apple AirDrop only works when Bluetooth and Wi-Fi are enabled. There are still massive security vulnerabilities in smart home devices. Do not click on links in emails without checking the sender!!!