snap
PackagesPackage: snapd
Installs packages that are confined and auto-updated by Canonical. Updates are deferred more than they are switched off — worth knowing before installing a service this way on a server.
What its options do in the lessons
From the same glossary the lessons render under their commands, so the two cannot disagree.
snap --hold- Suspends a snap’s automatic updates, indefinitely or for a period. Snaps update themselves, which is not always what you want from a server.
snap --classic- Installs the package in “classic” confinement, with access to the host system — required by some tools, and not to be granted without a reason.