The Links tool allows you to create a library of resources for your students, particularly of resources that you have not created yourself.
As the list grows, it might prove useful to organise it into categories to help your students find the right information at the right place. You can edit every link to re-assign it to a new category (you will need to create this category first).
The Description field can be used to provide advance-information on the target web pages but also to describe what you expect the student to do with the link. If, for instance, you point to a website on Aristotle, the description field may ask the student to study the difference between synthesis and analysis.