The paper discusses the importance of entrepreneurial skills for the development of personal and organizational effectiveness. At the very beginning, the concept of skill is defined as a learned or acquired part of behavior. Therefore, in order to improve a particular skill, it is important to practice regularly and improve these skills. All entrepreneurial skills are significant, overlapping and interconnected, so it is difficult to show one skill isolated from another. Some of the most important skills that contribute to the personal development of each entrepreneur are: development of self-management, analytical and creative problem solving, personal stress management, time management, etc. Furthermore, the importance of organizational skills that contribute to the entrepreneur and thus the company is emphasized, and some of them are: the ability to develop good relationships and cooperation, the skills of influencing others, motivation, counseling and training skills, team management and teamwork, empowerment and delegation. These skills are not only important for entrepreneurs, they can be applied in everyday life. Everything is described in detail in the theoretical part of the paper. In the last part of the paper, a survey was conducted through the questionnaire in which the respondents were entrepreneurs. The aim of this paper is to show whether the investigated entrepreneurs have developed personal and organisational skills. Accordingly, three hypotheses have been defined to obtain certain results.