1. Business knowledge: A manager needs to deeply understand the business in which he is involved. This includes knowing the products or services offered, the target market, competitors, operational processes and key performance metrics.

2. Industry knowledge: In addition to specific business knowledge, it is important for a manager to have a broad understanding of the industry in which the company operates. This involves knowing the trends, regulations, best practices and challenges facing the industry.

3. Financial Knowledge: A manager needs to have a solid understanding of financial concepts such as budgeting, cost analysis, financial statements and cash flow management. This allows you to make informed decisions based on the financial health of the company.

4. Marketing knowledge: It is important for a manager to have basic marketing knowledge to develop effective strategies for promoting and selling the company's products or services. This includes understanding the principles of market segmentation, positioning, branding, promotion and digital marketing.

5. Knowledge in people management: A manager needs to have knowledge in people management to effectively lead and manage the team. This involves understanding the principles of recruiting, selecting, training, developing, evaluating performance, and motivating staff.

6. Knowledge in project management: The ability to manage projects efficiently is essential for a manager. This involves having knowledge in planning, organizing, coordinating, allocating resources and monitoring the progress of projects.

7. Knowledge in technology: In an increasingly digital world, it is important for a manager to have basic knowledge of technology. This includes understanding key technology trends relevant to the business, being familiar with management tools and systems, and understanding how technology can drive efficiency and innovation.