systemctl list-dependencies multi-user.target
  !!! tree-like deps !!!
systemctl get-default
  view the default target that triggers others
  (graphical.target - in my case)
  https://www.reddit.com/r/commandline/comments/i4bjky/how_do_i_get_my_laptop_to_boot_directly_to_a/
systemctl
  [list-units] --type=target
  list-unit-files --type=target
  --state=failed

0  runlevel0.target, poweroff.target   Shut down and power off
1  runlevel1.target, rescue.target     Launch a rescue shell
2  runlevel2.target, multiuser.target  Launch a nonGUI, multiuser system
3  runlevel3.target, multiuser.target  Launch a nonGUI, multiuser system
4  runlevel4.target, multiuser.target  Launch a nonGUI, multiuser system
5  runlevel5.target, graphical.target  Launch a GUI, multiuser system
6  runlevel6.target, reboot.target     Shut down and reboot

multi-user (multiuser)
  for services

in case of bood errors we can add to boot params:
  systemd.unit=multi-user.target
  ?? rescue, emergency

2019
https://habr.com/ru/post/478846/