I was connected to the uni’s wifi, which I access with my institutional account, on my personal laptop. If using the app Notion - accessed with my personal gmail account - and writing on it, what can they see? do they have access to what I’m writing? Do they just see I’m using it?
You’ve asked a similar question here before this post. Have you been naughty? :-)
At your uni, you probably have what’s called a reasonable expectation to privacy-- the terms of use for accessing the computer and network facilities would be spelled out at your uni’s IT website.
The information observed and reported on by their tools most likely amounts to what websites and services you looked up by name, and the IP addresses & ports you accessed while using their network. It will be things like start & stop times, protocol used, number of bytes transferred, and maybe some “flags” on the connection. Flags in this case are special markings on the data flow to give the network hints about how to hand that traffic most efficiently.
MS Office Online, Notion, Gmail, they all use secured HTTPS connections, so the content is secured between you and the remote service.
As long as you’re not doing anything illegal or that severely violates the terms of use laid out by the University, nobody will even notice your traffic. Hack away.