Which are the competent authorities under the DSA?
On a national level there is not one competent authority but multiple authorities may be granted competences for subjects matters covered by the DSA under national law. To streamlining and coordinating these authorities every Member States designate a Digital Services Coordinator as the single point of contact (for a list see here).
On an EU level the European Commission as well as the European Board for Digital Services have a broad set of competences under the DSA from issuing implementation guidelines to supervisory functions.