What 2 things did the allies do to prepare?

To prepare for the D-Day invasion, the Allies conducted extensive deception operations, such as Operation Fortitude, which misled the Germans about the invasion location. They also amassed a vast fleet of ships and troops in southern England, conducting rigorous training exercises to ensure coordination and readiness for the amphibious assault on Normandy. Additionally, they carried out aerial and naval bombardments to weaken German defenses prior to the landings.