If possible, work into the wind. Ducks rarely decoy or come into the same spot two days in a row, especially if there has been heavy shooting. Ducks are enormous eaters and will sometimes forget about danger if good food is available. This can be seen in city parks where even wild ducks throw caution to the wind and risk everything for a free handout of corn or bread. Learn where the food is and chances are you will find good hunting.
Ducks trust other ducks and they like companionship.
That is why decoys work well in attracting ducks within range. Ducks are sociable. They talk to each other. This is why calling skills are important for successful duck hunting. The feeding habits of ducks are somewhat like those of fish.