Good ways to gain wait for 21 year old

i am 21 years old my height is 177cm and weight 53 i wanna gain weight .......pls suggest me some good ways to gain weight....what fruits to eat and exercises i can do .

Go for weight training and take lots of carbohydrates and protein.
Have you joined a Gym, it will really help you a lot.

You need a trainer that may guide you proper food different body have different needs however there is ever green advice like eat green vegetable, avoid oily food, regular exercise and increase the amount of protein, calories in your diet.