Rules.
In addition to cases, there are rules. Rules of Procedure for the Courts (both state and federal) and internal operating procedures for the courts (both state and federal). In addition, there are Rules of Evidence (again, both state and federal) as well as other rules that might come into play (administrative orders for the court, etc.). The good news is that these are almost always available on-line. Let’s take a hypothetical example- You have a federal case in the Central District of California. That’s a federal case.
The Federal Rules of Civil Procedure are available at many cites, including the US Government and Cornell’s Legal Information Institute.
The Local Rules of the Court are available on the Court’s website. All of these things are available to you!
Finding the rules on-line is usually fairly easily.