What is the difference between county district court and county circuit court?

.1.) Only district courts follow the Federal Rules of Civil Procedure
2.)Circuit courts have an appellate panel with three judges, whereas district courts have just a single judge.
3.)In district courts, there are always 6 to 12 jurors who must come to a unanimous decision to settle the cases. while circuit has smaller
4.)District courts provide sentencing and issue penalties; circuit courts do neither.