You can edit the resulting url before opening it or copying it, and choose between archive.ph, .md, etc. Editing is useful if you want to get rid of utm_source arguments, etc.

Apple’s Shortcuts is just a hodgepodge of built in functions, the best way to learn is just to try build something like this. You’ll be searching a few times for the little function you want until you find the right name for it. As far as discoverability goes, it’s OK, gets the job done. Naming things is weird too — let’s say you make a Text block, then you can only seem to name it when you reference it elsewhere (Select Magic Variable, scroll and tap it, then highlight it and Rename from the menu).