Res Sub Judice is a legal doctrine that prevents the re-litigation of an issue that is currently under judicial consideration in a court. This rule ensures that once a case is in progress, it cannot be taken to another court or judicial body, thus promoting judicial efficiency and finality in decisions. It affects ongoing legal cases by halting any attempts to pursue the same matter simultaneously in different courts, preventing conflicting rulings and unnecessary legal disputes. To manage a case under res sub judice effectively, it is important to focus on the case at hand, avoid initiating parallel proceedings, and ensure that all relevant matters are addressed in the current court. This requires careful attention to case developments and adhering to procedural guidelines to prevent complications.