I now know what page notes are. They are annotations without selecting any texts. However, I do not know how to use page notes effectively, or when to use page notes, for me or for my students.

I have known about highlights in Hypothesis.is. Highlights are only visible to myself, but not to others.

However, I have thought about how to use highlights as my own tips for students. Use highlights first while you are reading the article. Highlight potential texts first for later annotation! That way, there is no need to read the article one more time.