The phrase "crucial information" refers to important and essential details or facts that are necessary to understand or complete something. Full definition
The text seems to me to provide crucial information about the development of the genre and the position and relationships of major figures. (en.wikipedia.org)
The new structure provides crucial information for understanding how the protein binds to cellular components. (sciencedaily.com)
It also provides crucial information for synthetic biology, the branch of science that designs and builds artificial biological devices and systems. (sciencedaily.com)