What could be effective methods for managing negative emotions?

This question cannot be answered simply, as it requires relying on studies. In any case, methods such as relaxation, meditation, mindfulness, introspection, cognitive restructuring, emotional imagery, techniques from REBT (Rational-Emotive Behavioral Therapy), the evaluative style (Lazarus), facial feedback, attitude change, frustration tolerance, impulse control, anger regulation for violence prevention, etc., can be effective.