It’s a little more complicated than that. I don’t have my Silhouette software loaded on this computer at the moment, so I can’t recall if you can fill a shape. The Silhouette is only going to give you vector lines to cut and no fills that would be necessary for text.
I am with @evansd2 in that Inkscape is very powerful and useful and there are tons of tutorials. One helpful thing is to tweak the size of the icons in preferences to you can see them and menu items more easily.
A vector path is a line that when it has a defined color, will default to a cut. If that same shape, such as a circle, has a filled color, that will engrave, as long as the outline of the shape, which is the bounding path, does not have a defined color.
To engrave text, you have to make sure the text (which is a special object that can be edited using text functions such as size and font choice) gets turned into paths (which is a special object that can be edited with normal object functions). Text that is to be engraved doesn’t have a defined color to its bounding vector path. It gets converted to a path object and generally has a fill color.
When the Glowforge imports it, then it interprets each object as either a path to be cut/scored or a filled object to be engraved.
Some folks like Affinity Designer. It costs, but less than Illustrator and it seems more user friendly at the start.
Yes and no. If you want text to stand proud and un-engraved within a deeper background shape that has been engraved, you can’t just pop an unfilled object of text on top of a black background filled shaped. You have to “punch out” the text so that the text and the background object is on thing.
This is what I think you are trying to do. It’s an SVG. You can right click and save as and then open in Inkscape and see how it is made up.