Log into your router settings (usually via an IP address like 192.168.1.1). Look for a section called Guest Network or Wireless Settings. Enable the guest network feature. Set a unique network name (SSID) and a strong password.
The best secure wireless router for home use will have advanced security features like firewalls, VPN support, and automatic updates to protect your network from potential threats. Some top router options for secure guest networks include
The router may briefly restart the wireless radios. Connect a phone or laptop to the new guest SSID, confirm it gets internet access, then try to ping or browse to a device on your main network (e.g., a NAS or printer) you should receive no response.

Guest Network Access - provides secure Wi-Fi access for guests sharing your home or office network. Easy setup and management with Tether App. AC1750 Wireless Dual Band Gigabit Router - Archer C7.
The Guest networks offered by most routers are a nice security feature.The EA6200 offers a single guest network on the 2.4GHz band. Typically, a dual band router (one with radios for both the 2.4GHz and 5GHz bands) will offer two guest networks, one on each frequency band.

Linksys Wireless Router :: EA4500 Guest Network - Losing Guest Clients After About 24 Hours.Linksys Wireless Router :: EA4500 - Parent Controls Always On Over Guest Access? Cisco :: 2504 WLC / 1142 APs - Guest And Secure Network.
Unlike traditional security software that requires installing and updating on each device, eeros router-level protection automatically secures every device on your network. Wifi scheduling.