A, 'Date' or 'Place' is NOT "Standardised"; OR, a "Memory" is NOT "Tagged".
Here are some "Knowledge Articles" in 'FamilySearch':
How do I fix data problems in Family Tree?
How do I get rid of the red exclamation point in Memories?
I hope this helps.
And, here are some further/additional "Knowledge Articles" in 'FamilySearch':
How do I enter dates and places into Family Tree?
How do I request an update to the database of standardized places?
In Family Tree, what do the map pin icons and exclamation points by place-names mean?
And, here is a "Lesson" in 'FamilySearch":
FAMILYSEARCH CLASSES, LESSONS
Navigating, Adding and Editing, Standardization of Dates and Places on Family Tree
I hope this also helps.