University Guest WiFi Security

I’m currently accessing the University’s Guest wifi on campus which is password unprotected. You need a social media account or just a phone number to confirm a code to access it.

Question is do I need further protection on my laptop to keep any data secure?

Currently using AVG free and an M365 subscription, which includes defender, however the vpn won’t activate over the wifi?

Should I be paying for AVG pro which includes ‘advanced’ privacy protection? Or is this a gimmic ?

Any help is greatly appreciated - thank you

Uk based.

Edit 1: Network profile is set to “public”
However I still get warnings about being connected to a non password protected network from Windows saying “other people might be able to see info you send over this network” also AVG warnings.

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ensure your antivirus is updated and if your concerened with others seeing your traffic, use a vpn