Someone told me his wife had a breakthrough to nondual and no-self of late, and became very interested to learn about Buddhism. He asked me for book recommendations.

I told him: 

Recommended books to learn Buddhism, best to read in this order: 

https://www.amazon.com/What-Buddha-Taught-Walpola-Rahula-ebook/dp/B003OYIG00?ref_=ast_author_mpb

“An introductory book on basic Buddhist teachings written in very clear language. Despite being short (151 pages) it covers all of the most important teachings very well. There are several major types of Buddhism and the teachings covered in this book are common to many of the different types of Buddhism out there.”

Soh: very clear introductory presentation of Buddhism and Buddha’s teachings. I also believe Walpola Rahula realised anatta as he is able to express it succinctly and clearly.

Link: https://www.awakeningtoreality.com/2022/01/all-thrangu-rinpoche-58-books-at-35.html

• 5) https://app.box.com/s/3egh3hz9uqpraa1b7utdzdze4xf7tsbn - Marshland Flowers, very good writings on Buddhism by a very realised and experienced yogi and teacher

On book 2, 3, 4, I just wrote yesterday: 

Kyle Dixon:

“Thrangu Rinpoche’s Pointing out the dharmakāya is good.

Also Dakpo Tashi Namgyal’s Clarifying the natural state and the associated commentary Crystal clear.”

Recommended by myself, yin ling (clarifying the natural state led to her anatta breakthrough), kyle dixon (krodha), john tan liked too, daniel ingram also recommended clarifying the natural state.

Update: 

There's another book by Thrangu Rinpoche recommended by John Tan around 2009 - 

Essentials of Mahamudra: Looking Directly at Mind

- https://namobuddhapub.org/store/index.php?main_page=product_info&products_id=98

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Also, I will recommend reading some AtR articles, such as: 

https://www.awakeningtoreality.com/2007/03/thusnesss-six-stages-of-experience.html

https://www.awakeningtoreality.com/2009/03/on-anatta-emptiness-and-spontaneous.html