The APA Style website includes a number of Handouts and Guides.
Selected guides include:
The Excelsior Online Writing Lab is another excellent resource for how to use the APA citation style.
As of 08/19/20, it still contains information about the 6th edition. Be sure to click on the "7th Edition" tab for the most current guidelines.
APA Style offers sample student and professional papers, including a free annotated student sample paper.
Watch the 3:02 minute video below for a brief overview of how to format a paper, use in-text citations, and create a reference list.