ssh_config is wrong

The configuration for SSH contains wrong data (It is not the public key which needs to specified there). Furthermore, I suggest to add further lines and less templates. What about this:

Host taurus
  HostName taurus.hrsk.tu-dresden.de
  #Put your ZIH-Login after keyword "User":
  User marie
  #Path to private key:
  IdentityFile ~/.ssh/id_ed25519
  #Don't try other keys if you have more:
  IdentitiesOnly yes
  #Enable X11 forwarding for graphical applications. You don't need parameter -X when invoking ssh then.
  ForwardX11 yes