Adding Images, Files, & Forms: The Basics
You can insert a wide variety of files into your website through WordPress: images, MS Word PowerPoint and Excel, PDF, etc.
WATCH Learn the basics about the media library
To insert files while creating a Page or Post, use the Upload/Insert icons.
Insert Images More about inserting images
Insert Files (.DOC, .PDF, .PPT, etc.) More about inserting files
Insert a form on your Page. More about creating and adding forms