I want to gain weight fast i am 19 year old boy and my height is 6 feet's and my weight is only 60 kg ?

Check with endocrinologist: first, and it might just your built, so long you have good power and endurance, otherwise, same as losing weight: good balanced diet and exercise will help gain the right weight and power, good luck

Choose wisely: I recommend that you eat frequently and make healthy choices w balance of protein, carbs, dairy and fruits/veggies. Add in extra snack before bedtime!