Red means packages where the version you have is newer -> Forcibly update these, since the repo maintainers have lowered the version number for an unknown reason again
Blue means the packages in the repository are newer -> Update these packages
Black means the packages are fully updated with the latest version from the repositories -> Nothing needs to be done here.
NOTE: NOTE: disregard the forcibly update for Red if you disabled a repository for some reason, after performing an update with it active.