Third-Party Guides
https://www.businessinsider.com/what-is-zoom-guide?IR=T
Tutorials
https://support.zoom.us/hc/en-us/articles/206618765-Zoom-Video-Tutorials
Adding a background
To add a background, start Zoom and go to the "settings" gear icon.
In the "Settings" menu, navigate to "Virtual Background", click on the "+" to the right of "Choose Virtual Background" and then select "Add Image".
Navigate to the folder holding the image you want and then select the image and click on "Open".
The image will be loaded as a virtual background and selected for use. You can add multiple backgrounds and choose between them as needed.
I have added some backgrounds below that anyone is free to use. These are for the "16:9 (Widescreen)" camera setting.