The two most popular types of parsley are curly parsley and Italian flat leaf parsley. The Italian variety has a more fragrant and less bitter taste than the curly variety.
Fresh parsley should be kept in the refrigerator in an air tight bag. If the parsley is slightly wilted, either sprinkle it lightly with some water or wash it without completely drying it before storing in the refrigerator.
Fresh parsley should be washed right before using since it is highly fragile. The best way to clean it is just like you would spinach. Place it in a bowl of cold water and swish it around with your hands.