Highlights and Notes are only available for O'Reilly for Higher Education users, based on available authentication methods.
On the book reader page you can highlight important sections of content and add your own notes to enhance your learning.
Go to Highlights from Your O´Reilly by clicking on the Profile button 
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To the left, there is a list of the books where you have added highlights and notes. All Highlights and Notes appear under your Highlights.
You can export your highlights and notes to a spreadsheet, which includes book titles, chapter titles, date of highlight and links. It also shows your highlights and personal notes.
