Use on the main page of WikiProjects, under a heading like "How you can help".
{{Help Out|topic=|invite=|projcat=|newarticles=|langcode=|langname=|stubscat=|unassessedcat=|assessmentlink=|todo=}}
|topic= the topic name|stubscat= the project's mainstub category|unassessedcat= the project's unassessed articles category|assessmentlink= page where assessment is discussed|invite= an invite template|projcat= the main category for all the project's articles without the "Category:" prefix, i.e. which includesall the project's articles (MAIN_CAT in the project banner template).|newarticles= the subpage where new articles are listed|langcode= and|langname= (both are needed together) - the two-letter code of another Wikipedia which may be a source for translating content, and the name of it|todo= a todo list or page with a todo list on itNote that a reference to the project's cleanup listing is included automatically, if it exists.
Example with all parameters:
{{Help Out|topic= Venezuela|invite= Template:WikiProject Venezuela invite|projcat= Venezuela articles|newarticles= Wikipedia:WikiProject Venezuela/new articles|langcode= es|langname= Spanish|stubscat= Venezuela stubs|unassessedcat= Unassessed Venezuela articles|assessmentlink= Wikipedia:WikiProject Venezuela/Assessment|todo= Wikipedia:WikiProject Venezuela/To do}}