My preferred usages 

Before we see the key usages of APOC, I would like to show you my preferred ones; you will notice that calling them looks a lot like one half of the UNION query previously seen, as the keyword to use APOC procedures goodness is CALL.

A little help from a friend

Considering there are almost 300 items in APOC, it is user-friendly to provide this function: an entry-point to APOC. Should we want to find all the procedures and functions that contain the word meta in their name or description, we should use this query:

CALL apoc.help('meta')

The result is as follows:

Meta-related APOC search result

The text field will give you a clear text description. The signature field details the parameters and the values returned. Don't get impressed with it.

This query is very useful; I added it as a favorite (by pressing the Star button at the right of the query input zone) for quicker access. 

Graph overview

This query will give you an overview of your database:

CALL apoc.meta.graph   // This...