Introduction
Adding images to Wikipedia
Uploading images
Wikimedia Commons
Inserting images
Worth a thousand words
Editing the details
What am I looking at?
Galleries
For large picture sets
Summary
Review of what you've learned
Images are usually located throughout an article, individually, near the text that is relevant to the image. In some circumstances, however, a gallery of many images together may be appropriate if the collection illustrates aspects of a subject better than individual images can.
You can edit existing galleries by clicking that gallery and selecting the gallery icon that appears by it. To add a new gallery, click the Insert 
menu and choose the "Gallery" option.
The gallery editor has two tabs, one to add images and their captions, the other controls display options.
The order of images can be rearranged by dragging the images on the left, and more can be added using the "Add new image" button at the bottom of the list.
The options tab allows size and layout to be edited. The default display options are preferred in most cases.
