Let me first mention the Scrum Guide 2020 parts I am going to refer to in this post:
The Sprint Backlog is composed of the Sprint Goal (why), the set of Product Backlog items selected for the Sprint (what), as well as an actionable plan for delivering the Increment (how).
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the Sprint Backlog is updated throughout the Sprint as more is learned
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(Sprint Goal) it provides flexibility in terms of the exact work needed to achieve it
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