Training is one of the most neglected human resources, which is basically ignored by small companies. However, this is the most difficult one. The personnel directors of real big companies are mostly experienced in training.

Personnel can be divided into two stages. The next stage is recruitment and salary. You can learn it in one year and become proficient in a few years. The advanced stage is training and performance, which can't be done without more than ten years' efforts. Most people can only reach the lower level because they have never done anything at the higher level. A person who can do a very good job in training and performance is very popular in any multinational company, with a monthly salary of tens of thousands.