E-commerce app feeds design (Staggered GridView), Like Amazon, how to implement staggered GridView

that's super cool, but I have my dummy data in a separate dart file as a list of constructors, including images, prices, product descriptions,
I am trying to show it in cards just like you did but using mapping, but it shows the details of the only first item of the list,
when i use norlam gridview it shows all items,
why is it so?