"Postdoctoral" is neither a degree nor a degree, and only "doctor" can be filled in the degree column and the degree column.

If you want to fill in "postdoctoral", you should fill in the column of "work experience"

Of course, sometimes people will see "postdoctoral" in their "education" column, which is just a small ostentation and extravagance, hehe, don't fill it in the standard form like this.