How do I simply add an image to my home page. Just an image that I have already created and saved on my computer.
If your home page is an actual content page and not the modules page, then you upload the file to Canvas and then embed it into your course. Pictures are not supported on the modules page.
Since you're the instructor, those two steps can be combined into a single process: How do I insert course images into the Rich Content Editor using the Content Selector as an instructor? Students do not have this option.
All of those links I provided are from the Canvas Instructor's Guide. If you don't already know about it, you may want to check it out.
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