What line should you cast off of if the current is holding your boat against the dock?

If the current is holding your boat against the dock, you should cast off the line that is securing the bow (front) of the boat to the dock. This will allow the stern (back) of the boat to swing away from the dock as the current pushes the bow outward. Once the bow is free, you can maneuver the boat away from the dock more easily. Always ensure to keep an eye on your surroundings and be ready to adjust as needed.