The article analyzes approaches to the implementation of the approach to training qualified personnel in production enterprises through internal training, implemented by attracting the companies ' own resources, using mentoring techniques, mentoring and other methods to support the process of training new employees and improving the skills of experienced personnel. The paper highlights modern approaches to the organization of personnel training and development, as well as examines the degree of their impact on the company's production efficiency. In the context of accelerating technological progress and the dynamics of market processes, modern enterprises are faced with the need for constant development of human resources. The article actualizes the role of internal training as a strategic tool for improving the skills of employees, strengthening corporate culture and ensuring the competitiveness of enterprises in Russia. The authors draw attention to examples of successful internal training practices at well-known international manufacturing corporations. The article reveals how internal trainers, teachers and mentors can enhance the production potential and contribute to the accumulation of unique knowledge and skills within the company.