The key to a great non-fiction introduction is to be engaging and relevant. You could start with a personal story related to the topic to make it relatable. Outline the main points you'll cover and create a sense of anticipation. And don't forget to write in a clear and accessible style.
First, you need to clearly state the purpose of your non-fiction work in the intro. Share some background info to give context. And make sure to connect with the reader's interests or needs. Also, hint at what they can expect to learn or gain from reading further.