This is incorrect, courts have specific rules about what cases may be cited as precedent, and whether that precedent is optional guidance for the court it is presented to (persuasive precedent) or rules that must be followed where the decision conditions in the earlier ruling apply to the current case (binding precedent).
For instance, in a US District Court on most questions of federal law, as regards decisions of other federal courts: published decisions of any federal court can be cited as persuasive (most district court decisions are unpublished), and decisions of the Court of Appeals for the circuit in which the District Court is located, or of the US Supreme Court, may be entered as persuasive precedent.
For instance, in a US District Court on most questions of federal law, as regards decisions of other federal courts: published decisions of any federal court can be cited as persuasive (most district court decisions are unpublished), and decisions of the Court of Appeals for the circuit in which the District Court is located, or of the US Supreme Court, may be entered as persuasive precedent.