Thanks and agreed, this one is a bit short because I skipped writing about the namespaces, cgroups and chroot in details and kept it outside into separate articles, Sadly I've seen in past that when I post relatively long articles then those don't do good because of short attention span (and I don't blame anyone for this, this is just the fact that I noticed). Hence, for such large topics I tend to break it down into multiple articles. Sharing the individual links if you want to go through the individual topics in bit more detail.

[1] Namespaces: https://akashrajpurohit.com/blog/linux-namespaces-isolating-...

[2] Cgroups: https://akashrajpurohit.com/blog/linux-control-groups-finetu...

[3] Chroot: https://akashrajpurohit.com/blog/how-to-create-a-restricted-...