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SystemD is the manager of everything, and
it is used to manage everything on

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most Linux distributions, but some don't, including
the Windows subsystem for Linux or wsl.

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If systemd is used, it's the first thing that
is started after starting the Linux kernel, and the

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main function is to manage services, but it also
manages mounts, timers, patch hardware, and so much more.

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Amongst the key features of systemd is that it
is event driven, and that means that it can

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react to specific events and make sure that specific
stuff is only loaded when it is really required.

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The items that are managed by systemd
are known as units, and you should focus

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on learning how to manage services. With
systemd it can do so much more, but

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for the basis of Linux, it's important
to know how you work with services.