Weight gaining is all about nutrient dense diet and a good exercise regime which would help you to focus on your muscle mass not fat mass.
Next Steps
Stop eating outside processed food like bread, pizza, biscuits, chips , cookies , colas and sweetened drinks . These have empty calories and will not help you gaining weight Instead in future you will face the similar problem of belly fat
Health Tips
1. Eat frequent and small meals . it does not mean you have to eat forcibly , simultaneously keep a check on your appetite.
2. Keep a check on your sleep pattern
3. Include milk and milk products in your diet! You can drink milk before you go to bed.
4. Eat starchy vegetables like potato, sweet potato
5. Don’t skip your meals ! Have a good breakfast
6. Focus on local foods I.e . Include seasonal fruits and vegetables.
7.Include fruit and seeds smoothies in your diet ! It could be breakfast or any snack option.
8.thrice a week try to do muscle strengthens exercises or weight training.
9.Currently don’t go for any protein powder ! Include natural sources of protein in your diet like paneer,egg, chicken, dals ! Egg and chicken only if you re non vegetarian