If your WiFi is not working, your first step should be to reboot the router by unplugging the power cable from the wall for a few seconds and plugging it back in. If a reboot does not fix the problem check the lights on the front of your router. Usually there is one light indicating your "WAN" connection which typically looks like a sphere with a circle over it. If this light is orange or red there is a good chance that your router is not recieving an internet connection and you need to call our helpdesk.
Why can't I see my WiFi in settings?
If your WiFi is not available to connect to, you may have an issue with your device or router. First check to see if any other devices can see the WiFi network at your home. If none of your devices can see the WiFi then the issue is most likely at your router, and if other devices can see the WiFi then you have a device issue. If the issue is pointing towards your router your first step should be to unplug the power cable for a few seconds and plug it back in. Give it a few minutes and check to see if your WiFi is available on any devices.
Why do I see two WiFi networks?
Most routers sold in stores now are what is called a "Dual-Band Router". You will see two WiFi networks with relatively the same name because your router is transmitting at two different frequencies. The WiFi name with the "5G" at the end of it is a 5GHz frequency that will be much stronger for devices that are very close to the router, while the other network is a 2.4GHz frequency that will provide service better to devices that are further away from the router.