I was able to use the docs on the official website[0] without issues for both installing and upgrading on ubuntu. Trying to figure out what this page does extra that provides value beyond them.
It has mentioned "live-restore" option, which would let upgrade without restarting existing running containers
The arch version:
pacman -Syu docker
I think that this page gathers all commands in one place as quick reference
Looks like blogspam. Basic docker documentation already has the instructions. This page offers nothing extra.
Edit: Yup, user is spamming his own blog, often posting more than once the same article.
Purpose of this blog is to provide knowledge pill - to get this info sometimes you have to read a lot - there is everything nicely described without unnesecary talking - easy to copy&paste when doing IT work