There are 4 main types of pickles: fresh pack, fermented, fruit pickles, and relishes. The key ingredients for making pickles include cucumbers, water, salt, vinegar, sugar, and spices. Proper preparation of ingredients is important, such as using canning salt, 5% acidity vinegar, and fresh whole spices. Additional items like grape leaves, alum, lime, or Pickle Crisp can be used as firming agents. Special equipment may also be needed for making and storing different pickle varieties.