Uuuuhh, I don't know. I never did that manually, it seems to auto-update after upgrades.
To be honest I haven't thought of it. I only know it is recommended to re-install GRUB with GRUB updates. But simply pacman -Syu has so far always left me with a bootable system.
Yup, simple answer but an answer. I followed that too.
And don't be scared of the long page. Most things there are fairly specific to certain specific scenarios only. It's like "open here" on a can, except it also has instructions on what to do if the tab breaks off, you cut your finger, drop it on your toes and break them, start eating and hear a tornado warning, etc...
I have no idea what arrrr means/refers to nor what you're talking about. The only plug I can think of is buttplug, but that's probably not what you're talking about.
It could also be delivered to a pick-up box in which case it's at worst illegal or at least against ToS. "Billing address" just sounds like something potentially serious.
They also have movies, but I figured "buying" them over there is more expensive than getting DVDs or sometimes even BluRays shipped from UK to Slovakia via Amazon.
Random example: Blade Runner 2049 bought from seller RAREWAVES for €5.64 ($6.30 currently) incl. shipping, the DVD itself being £2.24 ($2.97 currently). It was new, not used.
"Renting" on YouTube for 48 hours within 30 days is $3.99, while "Buying" is $14.99.
Seems like I could get it used in "Very Good" condition on BluRay for around €6. Just UHD BluRay is more expensive than YouTube.
Also done in Slovakia. Well, was. Most shops have them unlocked even without coins nowadays, probably because people don't carry cash much anymore.
At least in my area.
Oh hey, I got "house"!