If you can’t connect to a Wi-Fi network on Mac

If you’re having problems connecting to a Wi-Fi network, there are several solutions you can try.

Make sure Wi-Fi is turned on. You can use the Wi-Fi status icon in the menu bar to turn Wi-Fi on. See Use the Wi-Fi status menu.
You may be out of range. Make sure your Mac is within range of the wireless network.
The Wi-Fi service may not be available in Network settings. See If you don’t see Wi-Fi in Network settings.
If you are connecting to a wireless network created by an AirPort base station or AirPort Time Capsule, restart the device by unplugging the power cable. Wait a few minutes, then plug the power cable back in. After the network is available, try connecting again.

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macOS User Guide