Krótki Kurs Piotr Niemczyk

90.11.Z - Literary activities and activities related to composing music

60.31.Z - News agency activities

60.39.Z - Other content distribution activities

61.90.A - Activities in other telecommunications fields

70.20.Z - Business and management consultancy activities

82.99.B - Other business support activities, not elsewhere classified

85.59.B - Courses and training for acquiring knowledge, skills, and professional qualifications in non-school forms

85.59.D - Other non-school forms of education, not classified elsewhere