Organizational behavior studies the way employees and groups within an organization act. It is a field of study that attempts to explain and predict human behavior that takes place within an organization. Namely, some situations occur in organizations that cannot be explained in terms of individual behavior, so such situations are examined in terms of a team or organization. Organizational behavior can be desirable or undesirable. Desirable organizational behavior includes voluntary mutual assistance among employees, as well as voluntary performance of additional work tasks and positive presentation of the organization in public. Undesirable organizational behavior includes employee behavior that calls into question the work and goals of the organization, and can also negatively affect financial results, or harm both the organization and employees. The progress and efficiency of the organization depends on the competencies of its managers. On the one hand, this includes the potential that the manager possesses, i.e. personality traits, motives and other values, and on the other hand, achievements, i.e. knowledge, skills and experience. Organizations are different, their needs are also different, but the influence of the knowledge and skills that will be listed in this paper can be equally implemented in all organizational environments. The skill without which the success of a manager is not possible is the skill of dealing with people. A good manager is able to feel his employees and show concern for them, which affects the maintenance of good relations in the organization, and precisely because of this, he can manage potential conflicts, but also influence the productivity of the team. His positive attitude and adaptability certainly affects the positive environment in the entire organization. Good managers show excellent communication skills, which affects not only a good relationship between employees, but also their motivation, as well as overcoming failures.