While you might not remember every detail about a certain event, I guarantee someone who was there does remember. Asking family and friends for ideas or details of a certain situation can give you a completely different perspective of the event or time in your life. That perspective might prove to be invaluable in your writing. Be prepared; once you get a group of family and friends together to reminisce, you will be shocked at how quickly the ideas come and how one idea can spark another and another and another.
Français: écrire une autobiographie, Español: escribir una autobiografía, Deutsch: Autobiografie schreiben, Nederlands: Een autobiografie schrijven, Русский: написать автобиографию(книга), 中文: 写一篇传记, Português: Escrever Sua Autobiografia, Čeština: Jak napsat autobiografii, Bahasa Indonesia: Menulis Autobiografi, العربية: كتابة سيرة حياتك الذاتية, हिन्दी: आत्मकथा (Autobiography) लिखें, ไทย: เขียนอัตชีวประวัติ, Tiếng Việt: Viết tự truyện, Italiano: Scrivere un'Autobiografia, 한국어: 자서전 쓰는 법
It may help to identify the reading level of the ideal reader of your book. You can determine the reading level based on the grade level of your ideal reader. If you account for ESL readers, you should aim for a grade 6 or 7 reading level. If you are writing for a higher education audience, you may write at a grade 8 or 9 level. You can use the Hemingway app to determine the reading level of your draft, or other online reading level tools.
Develop a central theme, main idea or thesis that clearly explains the purpose behind your autobiography. For example, your theme might be about how you overcame obstacles to become a stronger person, or it might explain why a particular passion -- such as mountain climbing or rescuing animals -- is so important to you. Back your theme with details and background information about your life experiences. For example, you might explain that your dad is in the military, so you've had to learn how to adapt quickly to new schools and unfamiliar environments. Or, you might discuss what it was like growing up in a poor, single-parent home, but how your family was always willing to take in injured or stray pets.