One is basic knowledge, and the other is skills (three poles of national vocational qualifications), both of which are yellow covers.
(2) There is also the book "Public Nutritionist" with a white background and a green cover, Guangdong Economic Publishing House, which contains the key points and difficulties of 1, 2,3,4.
(3) There is an old textbook, China Nutritionist Training Textbook, People's Health Publishing House.
At present, (1) is commonly used.