See also OldMeetingTopics

1?: Covering things from the simple "this is a commandline", to "How to use pipes" through the various text-utils and file-utils packages (ls(1), sed(1), grep(1), awk(1), mv(1), rm(1), find(1), touch(1)...) up to the really useful tips (^R, Meta- etc)

2?: Using LDAP, Cyrus and a MailTransferAgent of your choice to build a mail system that is suitable for delivering mail to 1 user or 10,000 users.