That is a good question Gracie. I'll try to answer and please, someone correct me if I'm wrong.

Look at it like a pyramid with the the US Supreme Court, the highest court in the federal judicial system, being at the very top. Then comes the US Courts of Appeals and the US District Courts on the next level.

Beneath the US Supreme Court there are 94 federal judicial districts. There is at least one district in each state, the District of Columbia, Puerto Rico, the Virgin Islands, Guam and the Northern Mariana Islands.

The federal judicial courts are divided into two levels of federal courts. These courts are the trial courts (for civil and criminal cases) and the appellate courts. There's also US bankruptcy courts and others but I won't go into that now.

The 94 appellate courts districts are organized into 12 regional circuits. The court of appeals hears appeals on cases from their respective district courts.

The Ninth Circuit Court of Appeals covers the states of Alaska, Hawaii, Guam, the Northern Mariana Islands, Washington, Oregon, Idaho, Montana, Nevada, California and Arizona. If you have an appeal on a federal district case in any of these states, it goes to the Ninth Circuit Court of Appeals.

Ohio is part of the sixth circuit on the federal level. And my home state of Virginia is in the fourth circuit.

Under this you have your state court systems and then other lower courts like magistrate courts or whatever system is set by individual states and jurisdictions with that state.