1. Hong Kong history and culture: a brief history of Hong Kong culture, Hong Kong historical stories, Hong Kong's return and historical torture, etc. It can help recipients better understand the history and culture of Hong Kong.

2. Literary works: Classic Hong Kong novels such as Love in the City and Days and Nights in Tin Shui Wai can make the recipients feel the unique charm of Hong Kong literature.

3. Food and tourism in Hong Kong: Food maps of Hong Kong, must-see attractions in Hong Kong and other guide books have been distributed to the recipients to help them explore food and tourist attractions in Hong Kong.

4. Book collection: Art books such as Hong Kong Documentary and Encyclopedia of Hong Kong Artists can be given as treasures to friends who are interested in Hong Kong's art and culture.

5. Art design: Hong Kong Film Festival, Hong Kong Design Yearbook and other books are suitable for friends who are interested in movies and design.

Please note that you can choose different types of books as gifts according to the interests and age groups of the recipients.