On Kognity you can add highlights and notes to any content and they will be saved in your personal notebook. 

Highlights and notes can make studying easier and more effective - they can help for lesson preparation, content comprehension, study focus and revision.

Have a look at this short video to see how the features work: 

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How to add notes and highlights to your notebook:
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Select the text you want to add a 'Highlight' or 'Note' to, then click your preferred color.

Once you choose your preferred color, the "Notebook" window will show up. From this window, you will have an option to add notes - type in your notes in the given field. If you want to just highlight the texts, leave the field empty and just hit "Save".

Other things you can do in the "Notebook" window:

Get an overview of how many Notes and Highlights you have saved for each topic and section.

You can add and edit Notes, print Highlights, and Notes but also delete those you don't need anymore.