A Practice Note explaining how to prepare and submit the parties' briefs (the appellant's brief, appellee's brief, and appellant's reply brief) in a civil appeal to the US Court of Appeals for the Seventh Circuit from a federal district court's order or judgment. This Note also explains how to brief cross-appeals and how to submit supplemental authorities using Federal Rule of Appellate Procedure 28(j) letters (also called Rule 28(j) letters).