Mac connected to wifi but not internet

I have a MacBook Pro 16inch that I haven’t turned on for a few weeks. I turned it on tonight and can’t get an internet connection. In the settings menu, the Mac says it’s connected to my wifi router. When I try to do anything requiring a connection, it says I am not connected to the internet. On the top of the screen where the icons are located, the wifi symbol is showing no connection, if you expand into network settings, it shows a connection. It shows an IP address and can do a full diagnostic on the network, but can’t seem to use it.

I’ve tried all the things, restarting, running a network diagnostic, changing date and time, trying other networks, etc. I finally got it to connect to a hot spot (for what ever reason only my moms phone works) and attempted an update. The update projected to take 26 hours on hotspot. We let it go for two hours then got a message that the update requires an internet connection. Greatttttt

It’s not my router, it’s the Mac. I have a full house of college students home for the holidays and I’m the only one suffering. Im a dumb college girl with no computer knowledge. I just need to do my homework 😩