Scientists in Germany have demonstrated a startling new form of surveillance: identifying people using nothing more than ordinary WiFi signals. By analyzing how radio waves bounce around a room, researchers can effectively “see” and recognize individuals — even if they are not carrying a device and even if their phone is turned off.
Nothing. Get a mini pc with 2 or more ethernet ports and install openwrt or opnsense or maybe others I haven’t tried, get a standalone wifi AP so if you ever want to upgrade anything you can do it separately, get a network switch to connect additional wired computers or wifi APs.
Then get in all the homelab groups and find the coolest stuff you also want and start making the home network made by you and for you.
If you already have a wifi router that can be flashed with custom firmware you can also use that to start out and use it as a wifi access point for a more powerful pc router later