1) Jonas lives in a highly controlled community where individuality and freedom are suppressed in favor of conformity and security.
2) People are assigned jobs and spouses by community elders and have no choice in these matters. Any infraction of rules is punished, often by "release" which is hinted to be fatal.
3) While Jonas' life seems ideal, the community is revealed to be a dystopia that maintains control through strict rules and eliminates differences between people.