Return the pagetitle from the resource with id 123: [[#123.pagetitle]]
Return the introtext of a parent of a current resource and display description for empty one:
[[#[[*parent]].introtext:default=[[#[[*parent]].description]]]]
Or, more efficiently (see this MODX blog article):
[[[[#[[*parent]].introtext:default=#[[*parent]].description]]]]
Return the content of the resources in rowTpl chunk while Wayfinder usage: