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Many of those are easy stuff for people just learning to use Linux. They all resolve a problem or give you information and you're likely most interested in the latter.
Like there's this article about 'tail': https://linux-tips.us/a-little-about-the-tail-command/ (which has a link to the 'head' command) and those even have practice files you'll download by using wget in the terminal.
That's because you configured that yourself, on Ubuntu it shows this as an example.
Code:
[email protected]:~$ ls -l /etc/localtime
lrwxrwxrwx 1 root root 36 aug 16 20:24 /etc/localtime -> /usr/share/zoneinfo/Europe/London
If you actually configured the timezone according to the Arch Installation guide you would have actually configured a Zone/SubZone. Unless you had a reason for using zoneinfo/GB?