Here I gather commands / setup instructions which took me some time to figure out and had satisfying results. I hope to help you get there faster than me.

File handling

Compress pdf file size

https://askubuntu.com/questions/113544/how-can-i-reduce-the-file-size-of-a-scanned-pdf-file ps2pdf -dPDFSETTINGS=/ebook input.pdf output.pdf

Free up disk space

ncdu -x

https://www.reddit.com/r/linux/s/Qn9MTOckXx

Setup University VPN (Cisco Anyconnect)

• sudo apt install network-manager-openconnect-gnome, sudo pacman -S networkmanager-openconnect
• go in the system GUI network settings, add a new VPN of type Cisco AnyConnect (Multi-protocol, openconnect)
• enter custom name
• set VPN Gateway e.g. vpngw.uni-wuerzburg.de
• set User Agent to AnyConnect-compatible OpenConnect VPN Agent see https://gitlab.com/openconnect/openconnect/-/issues/665
• all the other options can be left at default
• activate VPN in system GUI, enter and save your university credentials, answer possible 2FA