How to become fair?

Fair means what? Do you mean honest? Do you mean treating people with fairness? Are you being unkind in some way and others are pointing out that unkindness? Are your expectations so high for yourself and others that no one, including yourself, can meet them and that's unfair? Have you asked others how you could be more fair (including to yourself again)? Talk to folks, better yet get counseling.
Skin creams. I am guessing that you are actually concerned about the color of your skin. You are largely bound by your heredity (look at your parents and siblings). You skin will be lightest if you avoid the sun and tanning booths. Topical lightening agents are not reliable and have a moderately high degree of allergy. Best to learn to live with your current color.

Related Questions

How to reduce the weight and how to become fair?

See Dr. And eat less. Helpful weight loss diets have natural foods that take time to chew but contain few calories. Examples include carrots, celery, and iceberg lettuce (little/no salad dressing). When shopping for fruits, buy small ones no bigger than a tennis ball, because fruits have sugar. Drinks without calories include water and green tea. A calorie is a calorie, but surely avoid sugar & simple starch calories.

How to become fair[ become white] through using natural things? I am dark in colour. I want to become please help me

Doubtful. Probably never going to happen. Skin color is genetically determined. Consult a dermatologist- but no sure anything definitive will work.
Skin is a gift. Your life is a gift. I hope you realize having your skin be the color nature intended is not a disease. The wanting of lighter skin is a mental health condition and obsession that is not very healthy. You are really asking an impossible question despite what you read about or hear online. There is no such product that will change your genetics or safely change your skin color.

How can I become fair skinned and gain weight?

To gain weight. Eat healthy high calorie foods. Eat 6 meals/day. Work on strength training to build your large muscle groups. Workout w heavier weights w fewer repetitions. Sleep at least 8 to 9 hrs/night. Hydrate well w water. Foods to help w healthy weight gain: almonds, cashews, pecans, sunflower seeds, flax seeds, walnuts, hummus, Avocados, granola, trail mix, dried fruits, extra virgin olive oil, canola oil.