I use Cmd-Shift all the time to highlight from cursor to beginning or end of a line. Also use Opt+Shift for word highlighting. Today I learned if you do Cmd+Shift+Delete, it will just remove from the cursor to the beginning of the line! Of course, I tested and Cmd+Opt+Del will delete the word to the left of the cursor.
Anyway, brain got a tiny bit bigger today.
You only need to remember that you can combine alt and shift with cursor arrows, delete, and backspace. Experiment in a text Editor and see what’s possible.