How do I make my home wifi router safe?

Reviewed answer

Change the default passwords, keep it updated, and replace it once the maker stops updating it.

Change both the wifi password and the router's admin password from what's printed on the sticker if they are simple or shared.
Turn on automatic updates in the router's app or admin page. If it came from your internet provider, it usually updates itself.
Use WPA3 or WPA2 security. Turn off WPS and remote management unless you need them.
Put smart gadgets and guests on a separate guest network if your router offers one.
If the maker no longer offers updates for your router, replace it or ask your internet provider for a new one.

Get help if

If the router's settings changed without you, or devices you don't recognize keep appearing, reset it to factory settings and set it up again.