Pretty late to this thread, but I've just finished Lesson 1 so thought I'd include what I learned about ghosting.

A DaB member on Discord said this which stuck in my head: "You're only committed to a line, not a point." Ghosting is the way of developing confidence in executing that line/curve without actually committing yet, but once you actually put pen-to-paper and commit to drawing it, that's where your confidence and accuracy are revealed for what they really are.

In a way, you can use your linework as diagnostic to whether you're using ghosting effectively. After all, its purpose is to help you build confidence and draw better lines. For example, if your lines are wobbly, or if you're constantly missing the starting point, it's telling you something about your confidence and/or accuracy. You may have to slow down, or speed up, or "place" your pen tip more carefully when drawing the line. Ghosting helps you improve your confidence/accuracy/etc without having to commit to the line yet.

And you should be ghosting in the same way as your draw the line. Ghosting slow and methodical, but drawing quickly and "carelessly", defeats the whole purpose of ghosting. After all, the only evidence of your current ability is in the line you actually make, no matter how careful or perfect your ghosting is.

Hope this helps someone, that's what I learnt from Lesson 1 about how to use ghosting effectively to help me draw better lines and curves.