myList = [apples, grapes]
fruit = input()#this takes user input on what they want to add to the list
myList.append(fruit)
#myList is now [apples, grapes, and whatever the user put for their input]
append(): append the object to the end of the list.
insert(): inserts the object before the given index.
extend(): extends the list by appending elements from the iterable.