Study hard, keep your atelier tidy and cast magical spells.
In Witchworker you play as a cleaner who has been hired to tidy a Witch's atelier. You will soon find that your employer is conspicuously absent so it is up to you how to tidy and decorate the atelier.
While tidying you'll come across a variety of textbooks covering magical history, magical theory and practical magic. You have little else to do so you may as well start studying.
Perhaps if you study the books long enough you might be able to piece together a magical spell. Use your knowledge from the books to cast magical spells.
The atelier holds many secrets. Perhaps the magical spells you learn will help you uncover and explore the ateliers many mysteries.