Abstract. Since this is a psychological science that studies the subtleties and secrets of the human soul, vital activity, it is important. Accordingly, this article talks about the problem of lefthandedness, its causes, and the fact that left-handers are grouped into several groups: in particular, heredity; childbirth in women yesterday; from various compulsions; from conscious self-coercion. One of them, left–handedness, is an important and main difference in the educational process of a student. This is not a disease or a disadvantage. Left-handedness is caused by the specifics of the exchange of the main functions of the cerebral hemispheres. Lefties have their own peculiarities of brain function. In addition, scientists who have studied the problem of left-handedness: C.The opinions of Spinger, G. Deitch, E. S. Ayropetyants, E. D. Chomskaya, N.N.Bragina, M. M. Bezrukikh, V. L. Blanks, etc. are analyzed. Therefore, science divides lefties into four groups: Firstly, it is inherited. That is, blood is passed from generation to generation only through me. The number of those who belong to the first such group is about 10%. Secondly, from late childbirth in women. In pursuit of a career, despising shoes, not meeting blue shoes, women who got married late have great difficulty having a child born in the womb. In addition, the brain cells responsible for the function of the right hand are susceptible to damage. Every year more and more children are born with this type of lefty. The number of people employed alone in the country has reached 2.5 million people. Thirdly, from coercion. For example, a child relies on the help of his left hand in case of a hand burn. Fourth, from conscious self-education. This group also includes people who eat two-handed food and can write with double hands. As the people from the fourth group proved once again, it is known that people can learn something amazing, anything, if they try. According to psychologists, they will have a strong creative potential. In the study of left-handed children, various methods and techniques, surveys are conducted, their final results, scientific and methodological recommendations are given. Key words: primary school, maladjustment, school, intellectual training, individual training, physical training, seminar, training, research, experiment, method.