Second, don't buy controversial works.
Third, don't attack from all sides, collect widely.
Fourth, pay attention to collect all kinds of relevant information for systematic understanding and research, such as calligraphy and painting newspapers, art investment articles and books, auction catalogue, auction price list, etc. Only by collecting and analyzing information extensively can the return on investment be guaranteed.
Fifth, seize the opportunity to sell.
For more information, please refer to Jin Hantang's Encyclopedia of Painting and Calligraphy.