Your device's inability to connect to Wi-Fi networks might be due to a hardware-related issue, usually with the device's Wi-Fi module. In this case, consider taking your device to a repair shop, only if you have tried all the other solutions, including resetting your device to its factory settings, but none of them worked.
Consider this as an option, only if you tried all the common solutions to connect to Wi-Fi network(s), but none of them worked. Please bear in mind that by resetting your device, you will delete all the data (photos, videos, music, etc.) stored in its internal memory, therefore, make sure to make a copy of them.
See the don't know how to reset my device guide to learn the safest ways of performing this procedure.
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