WLAN but no internet connection with the notebook, why?

Mo
4

I have a notebook for about a month. I need it for the school. Until a week ago everything worked great, but now the internet is not working, but I'm connected to the WLAN. I have already tried to fix the problem, restarted the computer (several times) and set to airplane mode. Does anyone have any tips?

Li

At which provider are you?

Mo

A1

Li

What is A1

Mo

My provider 😅