Key differences
Skills and usual workstations help identify relevant work. They do not replace an assignment, schedule, or access permissions.
Skills
A skill is based on a process. For example, an employee can be qualified for Cutting, Assembly, or Final inspection. Skills relate employees to operations compatible with their capabilities. They also help you analyze which people can cover each kind of work. A skill expresses operational capability. It does not guarantee that the employee is available or has an assigned operation.Usual workstations
A usual workstation indicates where a person normally works. It makes work at their workstation or cell relevant, without restricting their activity to that location. The usual workstation and execution workstation are also different: the first expresses a stable preference; the second belongs to a specific operation.Illustrative example
Ana has the Welding skill and Cell 2 as her usual workstation.
These details complement each other. None lets you infer the others on its own.