Before changing network settings, find out whether the problem affects one PC or the whole connection.
Check the scope
Try a second device on the same Wi-Fi. If no device connects, check the router and provider status. If only one PC fails, note the message it shows and check whether Airplane mode is on.
Try reversible steps
Reconnect to your usual Wi-Fi and restart the PC. If you control the router, restart it according to the provider’s instructions; do not reset a shared or managed router without permission.
Use the Windows troubleshooter
Run the Network and Internet troubleshooter through Get Help on Windows 11. If a VPN or company network is involved, contact IT before changing DNS or IP settings. Keep a record of what worked and what did not.
Further reading: Microsoft Support: Wi-Fi issues.