Perhaps the most consistent tactic authoritarian regimes use is that of cooptation, or bringing groups and individuals into a beneficial relationship with the state so they do not challenge the legitimacy of the regime.
One common form of this strategy is state corporatism, often shortened simply to corporatism.
Another strategy of cooptation is patron-clientelism, or clientelism for short.
Corruption is a concept closely related to patron-clientelism and patron-client networks.
Power is the ability to compel or otherwise motivate people to take actions that they otherwise would not.
Personality Cult - More common to totalitarianism, some authoritarian regimes will attempt to portray the leader as some sort of near perfected version of the nation’s aspirations, embodying the wisdom, strength, and spirit of the people more generally.