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Systemd's Nuts and Bolts - A Visual Guide to Systemd
(medium.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
I have yet to read this, but. But the first part is like the internals of systemd, you won't immediately need it.
If you want to make use of systemd, you can skip directly to where it explains unit files. You'll soon see just how much it can do for you