The Upload Wizard is the default method for uploading files to Wikimedia Commons. You can select one or multiple files and begin uploading. Information such as date and camera position are added automatically (if available in the photo's metadata).
Where does the media work come from? (Choose the appropriate source)
For experienced users of the classic upload form:
See also the full list of copyright tags for many nations. The first section of that page also has other general tags for public domain sources.