There are several versions in the market: Huangdi Neijing, Huangdi Neijing 2nd Edition, Lingshu Jing 2nd Edition; Guo translated Huangdi Neijing Annotation and Huangdi Lingshu Annotation. Nanjing University of Chinese Medicine, 4th Edition, 3rd Edition; Zhang Jingyue's classic, Huangdi Neijing, Zhang Zhicong's Su Wen Zhu, and Huangdi Neijing's Ling Shu Zhu; Li Zhongzi's Essence of Neijing, Qin Bowei's Essence of Neijing; Wang Hongtu's Interpretation of Huangdi Neijing in Vernacular, Interpretation of Huangdi Neijing Lingshu in Vernacular, Wang Hongtu Neijing Lecture Notes, etc.
These editions are the best: recommend Hu Edition Bookstore in Yuan Dynasty. The oldest extant edition of Huangdi Neijing is Hu Shuju's engraving in Yuan Dynasty, because it is the only real thing that can be found at present. Long Bojian and Shi's Collection of Explanations of the Yellow Emperor's Internal Classics contains the notes of major annotators such as Ma Shan and Dan Bo.
Huangdi Neijing is only a traditional version, a simplified version and an English version. All the complete annotated manuscripts of Huangdi Neijing in the world were compiled by Bing Wang, and all the so-called versions were only translated, annotated or published by different publishers. If you really want to learn Huangdi Neijing, it is really important to memorize it and read various explanations. Recite the ten meridians first, master the twelve meridians and related diseases of each meridian, then recite them at will with interest, and constantly lower your goals.
The key is to persist in reading and reciting every day. You can recite simple questions in one year, and you are the king! Each paragraph can compare the ideas of different commentators, which is very helpful to readers.