Short answers, pulled from the story.
Jahangir wrote the Tuzk-e-Jahangiri himself, following the tradition of his great-grandfather Babur. He personally documented his daily life, judgments, and observations of the natural world rather than leaving the writing to court historians alone.
Jahangir wrote the first 19 years of his reign from 1605 to 1623. He gave up the writing of his memoirs in 1621 and entrusted the task to Mu'tamad Khan, who continued the memoirs at the start of 1623 until Jahangir's death in 1627.
The complete Tuzk-e-Jahangiri written by Jahangir himself is now housed in the National Museum of India, having been preserved since the 1950s. Some illustrations from the manuscript remain in the British Library today.
The Tuzk-e-Jahangiri stands as a unique historical document because it was written by the ruler himself with a depth that went beyond mere chronicle. The combination of text and image created a multi-sensory experience that was unprecedented in Mughal history, blending the written word with visual art to create a comprehensive record of his reign.
Jahangir documented the flora and fauna of India with the same care he applied to his political decisions and often commissioned paintings of these creatures to be included in his memoirs. He kept a menagerie of exotic animals and plants, which he used to entertain his guests and to demonstrate his power and wealth.