Which updates need a reboot on Rocky/Alma
A dnf update leaves the old kernel and old libraries running on Rocky and Alma. Use needs-restarting to see what needs a reboot and what needs a restart.
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Migrate CentOS Stream to Rocky Linux
Move a CentOS Stream 8 or 9 server to Rocky Linux with migrate2rocky: the README warnings, snapshot first, what distro-sync keeps, and the checks after.
Security-only updates with dnf on Rocky/Alma
Read dnf updateinfo on Rocky or AlmaLinux, list only the security advisories, apply one advisory or one CVE fix, and know when the patch needs a reboot.
EPEL and CRB repos on Rocky and Alma
Why dnf cannot find your package on Rocky Linux and AlmaLinux: what BaseOS, AppStream and CRB hold, how to add EPEL safely, and how to keep repos clean.
apt to dnf: equivalents for Rocky and Fedora
The dnf command for every apt command you already know, on Rocky Linux, AlmaLinux and Fedora, plus the repository and rollback parts that do not map.
Roll back a bad dnf update on Rocky or Alma
An update broke something on Rocky or AlmaLinux 9. Use dnf history to find the transaction, undo it, and pin the package so it cannot come back.
Pin package versions with dnf versionlock
Hold one package, like nginx or MariaDB, at its current version on Rocky Linux 9 and AlmaLinux 9 while dnf-automatic keeps updating everything else.