I want to ask of ways in which i can gain weight apart from the gym?

Dietary supplements: the safest way is to make an appointment with a registered dietician(RD) and map out a plan to increase you intake gradually in a balanced way. Ensure and other products are balanced liquid supplements that add calories in a healthy way to help you gain weight. See your GP soon, get a dietician referral, and get started !

Work out diet: The addition of calorie dense foods such as nuts, whole grain pastas, raisins, whole milk, pure fruit juices, butter, avocado, and complex carbohydrates is a healthy way to add more calories to your diet. Lean proteins are also important to build muscle mass. Good luck