I have to take nutritional supplements to gain weight and muscle. I exercise every day. At the beginning, I made a lot of equipment. Later I bought whey protein powder and creatine. After eating 1 month, the body has no effect and the muscle contour changes greatly. I have gained weight, too. You won't gain weight if you don't take supplements after light training, because your body loses water after training, and finally you can only achieve balance by decomposing protein, so you will lose weight. Therefore, I must use supplements together.
Practice more and eat more, and you will be as strong as an ox in a year.