Sprint planning has two topics

Sprint planning has two topics:

The first topic is: What can be done this Sprint?

The Product Owner Certification discusses the,

For example: If you are building a product to help the doctors be competent in diagnosing the patient's problem quickly and accurately, one of the Sprint may have the goal,

"Reduce the time that the doctors spend in talking to the patients to understand their medical history."

The second topic is: how will the chosen work get done?

The Development team, based on their collective capability, forecasts what end-to-end functionality can be delivered in the Sprint to achieve the Sprint Goal and how they plan to deliver it.  

For example: For the Goal of reducing the doctor's time talking with patients to understand their medical history, the possible Product Backlog Items could be:

-      Patients medical history  

-      Pre-existing condition checklist

-      Capture recent vitals

-      Capture symptoms

-      Alexa integration for capturing data

These times form a Sprint Backlog. Optionally team's can also split these Product Backlog Items into specific tasks.  What I also recommend doing as part of Sprint Planning is to identify ways to measure the outcome like KPIs.