Working with Images and Other Media: The Basics
You can insert a wide variety of files into your website through WordPress: images, MS Word PowerPoint and Excel, PDF, etc.
Insert Media :
Insert Images More about inserting images
Insert Files (.DOC, .PDF, .PPT, etc.) More about inserting files
Want to swap out an old file with a newer one? Replace Media
Thumbnail not looking the way you want? Edit the thumbnail.
Insert a form.
Video files can be embedded into a page so your viewers can play with one click. From YouTube or Vimeo paste the URL of the video in plain text on your page. More information about Adding Video to your page.