New laptop won’t properly connect to my WiFi

Hi, sorry I don’t know if I tagged this correctly or not, I’ve never posted before. I got a second-hand lenovo thinkpad T14 to do my university work on but when it connects to my WiFi it tells me ‘no internet.’ I saw on a different post to check the device manager for something but I have no idea what I’m looking for and I don’t want to mess anything up on accident

I have no idea what to do, my old laptop connects to the WiFi just fine, but it’s fan is busted, the battery is awful, it’s nearly 5 years old, and storage is almost completely full, I’m not sure if it’ll get to the end of my last uni year before dying on me, so this newer one not connecting to my WiFi is just stressing me out. Sorry if this is too much info, what can I do?