Removing the background for rendering - Blender Quick Start Guide [Book]
3d view - Background image is not displaying in rendered mode - Blender Stack Exchange
How to Render a Background Image in Blender 2.8 Using a Camera Background Image - Henry Egloff
Please add background image feature as in blender 2.79,in blender 2.8 we can't see the background image from front,top and side views - User Feedback - Blender Developer Talk
Blender Create Backdrop Tutorial - YouTube
Why is my hdri background image renders with low quality? - Basics & Interface - Blender Artists Community