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When working with systemd, you will work with
targets. A target is a group of services.

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Some targets are isolatable and that means that you can
use them as a state that your system should be in.

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There's four of them
that you should know.

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These are Emergency target, Rescue Target, Multi User target,
and Graphical target, where emergency and rescue are only used

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if you need to fix something. Multi user is
the typical state that the server without GUI is starting

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in, and graphical target is what your workstation
is starting in if it uses a graphical desktop.

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In this target, different units are started
and you can use systemctl list dependencies

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on the target to see the contents
and the dependencies of the systemd targets.

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That makes it crystal clear what
exactly is started within the target.

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You can use systemctl getdefault to check
your current default target. And if ever you

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want to change you use systemctlsetdefault to
set a different target as a default.

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Let's analyze what these
dependencies are all about.

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So I'm starting with the systemctl.
What was it again? It lets you

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Tab completion. Do you see that
all these commands that are automatically displayed?

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Well, I'm going to make that get default and use
tab completion to automatic automatically completed. So my default is

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the graphical target. So if I want to know what's
going on in my target, I'm using systemctl list dependencies.

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And there I can show in my default target,
that's a graphical target. I can see everything that is

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started nicely indicated with these green dots or white
dots, where green means it is currently running, white means

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it's not currently running, and if you would see
red, then that means that something has gone wrong.

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Here you can see what exactly is happening
to get your system into a certain state.