What are the duties of a Project Manager and what skills should they have?

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Project Manager Functions
Before we begin, it is important to understand that each organization has specific needs depending on a wide variety of factors such as its corporate culture or its way of approaching projects. Therefore, these basic functions of the Project Manager may or may not be fulfilled depending on each structure:

Link: The Project Manager (or PM) is the communication link between a client and the company that executes/leads the project and/or the interdepartmental communication link. He or she is responsible for ensuring that communication flows without obstacles .
Coordinate: Linked to the previous point, it is extremely important for the PM to know how to identify and coordinate all the stakeholders of a project, especially when different departments are involved in it that are not related to each other.
Lead: The PM must lead the team responsible for achieving the strategic goals or objectives that have been set . This leadership should not only be based on budget or quality control, but also on a human level. The PM must be international email database able to involve and make each of its members responsible, motivate them and accompany them to achieve excellence at a professional level.
Planning based on time, resources and budget: The PM must understand the scope of the project in order to then make a realistic plan based on it, establishing what and when the deliverables must be presented or the project must be closed. In addition, it is essential that the Project Manager can plan according to the human and economic resources available to match expectations with reality and deliver quality work in the planned time . To create this plan, the Project Manager can use previous documents created at the beginning of the project to be able to refine the objectives such as the business case or the benefits management plan. These documents are created to study both the viability of the project and to establish objectives in line with the strategic vision of the organization requesting the project and, thus, establish how to measure the success of the project.
Control/supervision: The PM is responsible, together with the team, for ensuring that the project carried out meets the expected quality standards. He/she must control the resources assigned to the project, as well as the time and budget that is being consumed. Quality is delivering a project that meets the objectives defined in the benefits management plan in the appropriate time and under the agreed budget.
Project Management success
What skills should a Project Manager have?
Generate business!
For a Project Manager, although it is always advisable, it is not essential to have extensive technical knowledge of the area in which the project is being developed. Since it is a team effort, the skills of the Project Manager must be, in essence, different from those of its more technical profile members.

The PMBOK guide (Project Management Book of Knowledge) defines as essential interpersonal skills such as:

Ability to work in a team
Leadership ability
Ease of decision making
Ability to communicate in a clear and assertive manner
Motivational and inspirational
Influence (understood as a person who has the ability to positively influence others)
Facilitator. Must be able to assist in times of crisis and provide solutions throughout the entire project life cycle.
Great organizational skills and meticulousness
Risk management capacity
Therefore, the skills of a PM should be more in line with a strategic leader than a technical profile.