Troubleshoot pictures and other OLE objects on forms and reports

I don't understand the difference between unbound and bound, embedded and linked objects. Please give me an overview.

When I double-click a linked or embedded object, I get a message saying the file can't be opened.

I want to see the content of my object in my form or report, but I see an icon instead.

My picture becomes distorted when I size it.

Why do the colors in my picture or on my form look so bad?

Why did the size of my database increase significantly more than the size of the object I added?