Joan Rowling occasionally writes texts for the Pottermore website about the magical world of Harry Potter: biographies of characters, stories about magical places and objects, behind-the-scenes comments about the writer's kitchen. In 2016, some of these texts were compiled into official electronic books “On heroism, deprivation and dangerous hobbies”, “On power, politics and impudent poltergeists” and “Hogwarts. An incomplete and inaccurate guide." However, many texts remained behind the scenes, and this collection is intended to fill this gap.