This book series aims to teach initial letter sounds, with a focus on the most commonly presented form of English letters: lowercase. For optimal results, it's recommended to introduce the series gradually, presenting one to three books to the child within a week and rotating different letter books each week. You can start introducing these books as early as 18 to 24 months. When reading to a child, it's crucial to emphasize the letter sounds and ensure each sound is isolated, enhancing your child's readiness for blending sounds. Once your child begins to construct sentences, you can motivate them to read the material aloud, either to you or others, to the best of their ability. Avoid correcting the child unless they seek guidance. After they read the book, if the child struggles to rectify their errors, they will soon grasp the correct way!