If you want to gain weight, you must first do three things: exercise, diet and rest.

Rest:

You must sleep 12 yuan every day to get 8 hours' sleep.

Diet:

For thin people, this is the most important thing. You should have three meals, two bowls of rice and one dish for each meal, and eat more meat, eggs and milk. If you can add meals, fruits, nuts and eggs in the morning and afternoon, you really won't have time to eat three more meals. Put an end to junk food and add meals after exercise every day, preferably high-protein food (important). Remember, whether it's muscle or fat or absorbed from food. Be sure to eat well and eat more protein. What are the high-protein foods?

Exercise:

This is not clear in one or two sentences.

The most basic thing is to run for ten minutes every day to warm up, and then two parts a day, three movements in each part, five groups of each movement, ten times in each group. Learn more about body muscles, technical terms and training methods of various parts of the body, and recommend Wade training method.