i want to become fair, what is the best cream?

Your questions answer depends on your skin condition. Is it dry or oily?  Lots of cream available to become fair. But it is difficult to find the best one. As far as I know some cream really works well.  You can check any of those. Olay Natural White Day Cream suits all normal and dry skin. Lotus Herbals White glow skin whitening and brightening skin emulsion suits oily skin really well. But I prefer natural way. I followed some home made and natural solutions which helped me a lot to become fair.

Our skin color depends
upon various factors. Main factor is pigment melanin which is produced in the
skin cells known as melanocytes. Darker skin means melanocytes produce more
melanin. Sometimes, skin may get darker due to tanning resulting from exposure
to sun rays. In fact, melanins build a protection against the ultraviolet rays
that can damage our skin. There can be many other causes for dark skin other
than heredity and overexposure to sun. These may include environmental
pollution, dry skin, stress, as well as prolonged usage of cosmetics having
lots of chemicals in them. If your dark skin is not due to genetic reasons, you
may take an attempt to lighten your skin naturally.

Learning
to properly care for your skin on a day-to-day basis will help your skin stay
light and tight, while more substantial and scientifically-proven lightening
products are also widely available.