@ChrissyRamirez The Apply to Each action isn't necessary when getting the response details. If you started building your flow in the New Designer—Power Automate will automatically nest the Get response details inside an Apply to Each action.

I would recommend using the Classic Designer for your flow especially since you are using the MS Form trigger and action. The New Designer still has bugs.

I would recommend checking out this Tutorial I recently uploaded: How to Get a Microsoft Form RSVP Response into a SharePoint List
I cover the following in this video tutorial:
✅ How to get a Microsoft Form Response into SharePoint
✅ How to get a Microsoft Form ID
✅ How to get a Microsoft Form response
✅ How to Build a Microsoft Form with Conditional Fields
✅ How to used Branching in Microsoft Forms
✅ How to format Microsoft Form multiple choice responses for a SharePoint multi-choice column
✅ How to parse a Microsoft Form multiple choice response as string of text
✅ How to convert a text response to a number
✅ How to use the Switch action
✅ How to create a custom email confirmation for a Microsoft Form submission
✅ How to Create a Custom View in a SharePoint list
✅ How to use the Compose Action
✅ How to write Power Automate Expressions
In regards to getting information from another list. You definitely don't want to nest a Get Items action inside an Apply to Each action. After you Create an Item in the SP list, are you wanting to get additional information from another SP list to insert into the list you've created your item in?
Hope this helps!