The only way to gain weight is to eat, but it should be scientific, not to increase the burden on the stomach, and at the same time to strengthen exercise. After all, weight gain is not to increase fat.
I think it's okay to drink some beer, and it will also help you gain weight, as long as you don't drink too much and get drunk, otherwise it will hurt your health.
I think gaining weight is the easiest thing (because I gain weight easily). . . . ), the heart is wide and the body is fat, so I am in a happy mood, plus a reasonable diet, eating fat and sleeping fat, haha!