Browsers no longer work properly?

Hello!

I was just getting home from school when I wanted to go to Opera and Discord. At first, I planned to open Discord from the sidebar like I always do, but nothing worked – it said "error" at the top. When I typed Discord into the search bar, the page wouldn't load. I thought, okay, maybe there's something wrong with my internet or router. I checked, and everything was fine there. Then I went to Microsoft Edge and typed in Discord, but it didn't work there either. What's wrong? It worked at school, but not anymore. Is there anything I can do about it? I've also noticed that both browsers give errors when I try to visit another website. It just takes longer to load, but Discord doesn't work at all, and I don't know what else is wrong. I was lucky that gutefrage still works.

answers would help a lot <3