Unfortunately, Linux manuals are pretty scattered around. I'll try to find something for you:

• If you want to learn the very basics of Linux command line, here's what I found on the web: http://www.ee.surrey.ac.uk/Teaching/Unix/ ;
• For on how to use GNU user-land tools (Bash, cat, less, grep, sed, etc.), I recommend the GNU manuals which are very well-written: https://www.gnu.org/manual/blurbs.html (example: Bash manual);
  • GNU manuals are also downloaded for offline read by default. These manuals are provided with info.
• For GUI desktop, it depends on what Desktop Environment (DE) you use:
  • KDE wiki with tutorials: https://userbase.kde.org/Tutorials
  • GNOME app overview with documentation: https://apps.gnome.org/
  • If you don't know what DE you use, KDE uses sharp edges for windows and GNOME uses round edges ( 👁️👄👁️ ).
• For system, as @Terumo@lemmy.world pointed out, for system-specific stuff, there's ArchWiki that has topics about everything.
• If you want to understand what are the /usr, /usr/local, /etc, /dev, etc. filesystem directories, you want to look at the Filesystem Hierarchy Standard: https://refspecs.linuxfoundation.org/FHS_3.0/fhs/index.html
• There is also a free training course for Linux: https://training.linuxfoundation.org/training/introduction-to-linux/
• If you're a developer and want to find out how deep the rabbit hole is, you may want to look at an online book Operating Systems: Three Easy Pieces: https://pages.cs.wisc.edu/~remzi/OSTEP/

EDIT: Forgot this important material:

• If you need to know command-line argument specifics for a particular program, use manpages (For example, to find brief information about grep, type man grep in your shell, and info grep if you need a complete manual).

You can try to enroll into Linux Foundation Certified Sysadmin course. It is quite a respectable certification. Try to have some practice every day as well.

I could only tolerate ElectroBoom-style "This video is sponsored by oscilloscope company" ads.

If you fork a process, then it's the two separate processes but sharing the same memory with copy-on-write mapping.

PHP is powering a LAMP

Ask ElectroBOOM, he would definitely make a video rectifying it *bang* OUCH F___ S___ why is there a loose wire?

FYI, the creator of an original Arch-chan is RavioliMavioli: https://raviolimavioli.github.io/ . The pic above seems to be a derivative work.

~ $ adware
(...ncurses ad featuring blockchain shows for 10 seconds...)

Sorry, internet connection is required to run adware.
Aborted
~ $ 

(plugs in ethernet cable)

~ $ adware
(...ncurses ad featuring Threads displays for 10 seconds...)
(...ncurses ad featuring next-gen Android displays for 10 seconds...)
Press CTRL+C to skip the ad
[^C[^C
Got tired from ads? Buy Adware Pro for $5.99/mo [Y/n] n

ADWARE SHELL
(C) 2023 Buy-n-Large Corp. All wrongs reserved
---ad---
How much do YOU think this advanced operating environment is worth?
Just press F1 to get the answer!
---ad---

Activate Adware
Go to Settings to Activate Adware
% exit
Please watch all the ads to be able to exit.
(...ncurses ad featuring alt medicine displays for 30 seconds...)
(...ncurses ad featuring ad-blocker for 30 seconds...)
[^C
Interrupt rejected. Please watch all the ads.
[^C[^C[^D[^X[^Z[^Z[^Z (unplugs ethernet cable)
Interrupt rejected. Please watch all the ads. Buy Adware Pro for $5.99 to allow interrupts.

The last step I leave to you.

This is why airplanes crash

There should be a hardware reset pin hole somewhere near the place where PIN/SD cards are placed. It was designed specifically for VIM users. Hold it with a narrow object.

EDIT: typo

First Aid kit