The federal court system has three main levels which are 1) district courts 2) circuit courts and 3) Supreme Court of the US.
The District Courts are the ones that have original jurisdiction, which means that is the one that is the starting point for any case that arises under federal statutes.
The Circuit Courts are courts of appeals and the US Supreme Courts is the highest court of the US and decides appeals on all cases in federal court or state court with federal laws.
A court may have original jurisdiction or appellate jurisdiction, or both. In the United States, the District Courts, as the general trial courts of the nation and the first level of the federal judicial system, have original jurisdiction for civil and criminal cases, but they do not have appellate jurisdiction because none of the other courts can remit a case to an inferior court.
