Patience

Prince Fabian was very knowledgeable and had everything in his mind. He didn't even need a book to discuss magic but he brought a lot for Stella to read. 

Since it was something new and foreign to her, Stella was always quick to finish reading the books he brought for her. Fabian had to quiz her every time she said she finished reading a book to ensure that she truly read it and did not skip any part.

He was amazed that Stella even had a lot of questions noted about the parts she didn't understand or was curious about.

'Hehe. Don't underestimate a bookworm. Reading was my life before,' Stella proudly thought as Fabian praised her.

She was swamped with books to read in the first week which Fabian thought would take her more than a month to do but she read it all quickly because she was already used to reading a lot. As such, she understood the basics of magic much quicker than she thought.