Opinions are in those jurisdictions usually published at the direction of the court, and to the extent, they contain pronouncements about what the law is and how it should be interpreted, they reinforce, change, establish, or overturn legal precedent.
When opinions are issued by a court in a particular jurisdiction, they often serve as authoritative statements on the interpretation of the law. These pronouncements can either uphold existing precedents, introduce new ones, or even overturn previous rulings.