These user tips from Thematic Index to Photos for Mac Related User Tips should help explain how to get from iPhoto to Photos:
Notes on Migrating an iPhoto Library from iPhoto to Photos for Mac
Moments in Photos are the New Events
These user tips from Thematic Index to Photos for Mac Related User Tips should help explain how to get from iPhoto to Photos:
Notes on Migrating an iPhoto Library from iPhoto to Photos for Mac
Moments in Photos are the New Events
If you import then you can not - you typically do not import anything in migrating from iPhoto to Photos - you migrate by opening the iPhoto library with the Photos application and it keeps your structure ad described in one of these links - Links to User tips re migrating from iPhoto to Photos - specifically How Photos handles content and metadata from iPhoto and Aperture - Apple Support
LN
How to keep folders and albums when importing from iphoto to photos