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755 is not a number. It is nine switches written in shorthand, three for the owner, three for the group, three for everyone else. Learn the 4-2-1 trick once and you stop looking it up. Then learn the part almost nobody knows: most permission denied errors on a file are really about a directory.
Everyone repeats that VMs virtualize hardware and containers virtualize the OS. True, but it hides the real thing. A container isn't a tiny VM. It's a normal process on the host with blinders on, fenced off by two Linux kernel features.
Every OS hides this somewhere different, and half the guides online still give the Windows 10 path. Here's where the setting actually lives in 2026, plus the auto-disable option that beats turning it off outright.
A Windows shortcut is a file that contains a location. A symbolic link is a location. That difference is invisible in Explorer and decisive to every program that is not Explorer, which is why a shortcut that works when you double-click it fails the moment a script tries to read through it.
