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 main stub 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 includes all 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}}