New Collection

%second% Second of the minute, 
for example 33 %post_id% The unique ID # of the post, 
for example 423 %postname% A sanitized version of the 
title of the post (post slug field on Edit Post/Page panel). 
So “This Is A Great Post!” becomes this-is-a-great-post in the URL. 
%category% A sanitized version of the category name (category slug f
ield on New/Edit Category panel). Nested sub-categories appear as 
nested directories in the URL. %author% A sanitized version of the 
author name.