Work as root (sudo -i) for tasks 1 and 3, and as student (sudo -iu student) for task 2. Write answers to the files in /root/lab-answers/. The lab creates users ana, ben and student (password Lab-Pass-1), and checks that /srv/finance and group finance don't exist yet; le-lab reset removes them.

Tasks

Create /srv/finance owned by root and the group finance (create the group, with ana and ben as its members), where members can create and edit files, new files belong to finance, members can't delete each other's files, and others have no access. ls -ld /srv/finance shows drwxrws--T root finance (mode 3770).
As student, make ~/private a directory only you can enter, and ~/private/notes.txt a file only you can read and write, using octal.
List every setuid file on the root filesystem, find the one that lets users change their own password, and write its full path to /root/lab-answers/3.

Hints

groupadd, usermod -aG (or gpasswd -a); chown root:finance, chmod 3770. Test with su - ana -c 'touch /srv/finance/a' and su - ben -c 'rm /srv/finance/a'.
chmod 700, chmod 600; stat -c '%a %n'.
find / -xdev -perm -4000 -type f 2>/dev/null; ls -l shows the s.