First Make Sure There Is Not an Internet Outage in Your Area. If not then Reboot Your Router and Modem and See if Your Wi-Fi is Working on Other Devices. If it is working in other devices. It can be a issue on your laptop or computer like wifi driver issue first connect your laptop with ethernet cable and update the wifi driver if its updated and still not working then it can be a wifi chip issue then you need to take it to a computer professional to change the wifi chip

Wifi network problem