Pick the ginger having thin skin, as thick skin indicates that the ginger has dried and is old.
Unwrinkled and firm skin is an indication of fresh ginger. You can easily scrape the skin using a fingernail.
If you want to store the ginger, place it in an air-tight bag and store it in the refrigerator.
You can identify fresh ginger through its flesh color, which is bright yellow. Fresh ginger has a spicy taste and spicy aroma. When ginger starts spoiling, it will lose its firmness and color.