Nodes are the building blocks of Drupal.
For information about how to use a specific type of content type or node, see Content Types and Views.
For specific issues regarding Image and Image gallery nodes, see the Images Help section.
For questions about using the WYSIWYG text area that is used to enter text into the body of the node, see the WYSIWYG help section.
If you're ever unsure of how a field in a content type should be used, look for the small gray text below the field. This is called "Help Text," and often shows you a concise explanation of how to use the field correctly.