The feed is the view of Instagram where you can see all the photos that a user has uploaded in a temporary order, either as a grid all together or scroll individually.
Regarding the feed, there is always a debate about whether from the grid view it should give the impression of care (that your history of photos together are visually attractive, with good color harmony) or if, on the contrary, it is best to publish without taking into account Keep this in mind, as it can be a barrier to uploading pieces that could work, but since they don't match the design of the feed, they are left out.