I'm connected to wifi, but no internet

[Patmosx]

I have window 10 and i have no connection to internet. I still connected to wifi, but i get yellow triangle on wifi icon

 

[Joe Porter]

Can any other devices connect to the internet?
Reset your router.
Test the connection using an Ethernet cable and see if you get an internet connection.
Try connecting directly to the modem with an Ethernet cable and see if you get a connection.