Mendeley reference manager

When references are added to a reference collection, there are often small green dots next to the reference entries, indicating that a particular reference entry has not been opened. When you open the PDF file in the reference, the green dot disappears. In addition, there are stars next to each reference, which you can click on to mark a particular reference as your favourite.

You can find all the bookmarks you have marked as favourites in the favorites tab on the left.

In the Recently added tab, you'll find the reference books you've added to your collection in the last 30 days and in the Recently read tab, you'll find the reference books you've read the PDF file of in the last 30 days.