Remember that there are two elements in the Sprint Backlog:
1. Items selected from the Product Backlog: we dont change them after the Sprint Planning.
2. Tasks created by breaking down the items: they are always changing. Tasks are referred to
as work in the PSM I exam and Scrum Guide.
The tasks (aka work defined in the Sprint Backlog) are changing all the time. However, the Scrum
Guide is not clear about the items in the Sprint Backlog. Jeff Sutherland believes they shouldnt change, and old writings from Ken Schwaber say that the items are frozen after the Sprint
Planning. The only exception is that when youre done with all items, you will pick the next item
from the top of the Product Backlog.*##**##*