I AM an ignorant, and admitted that from my first message. I'm just a physician. Don't know about all this stuff, but I admire people who do.
I already had tried something like the code in your last message, but the "preview" plugin is much better. With your way, it just shows a bare skeleton of the linked tiddler, without formatting, or links, or images.
Since I don't know how to install and try the contribution of linonetwo from GitHub directly, I think I'll wait till tobibeer merges with his suggestion and then I'll download the preview plugin again.
Thanks for all, Mr. Gifford. And strikke, too. You people are truly nice.