Collections are a great way to store websites relating to a topic you have researched. By naming a collection in Microsoft edge you get to group together websites of a similar topic. The real value comes though when you can share that collection with others.
You can export a collection to many formats including Word, Excel and other formats. By exporting to a OneNote in a Microsoft team you can easily share collections and also get the link to that OneNote page to be shared using other means such as instant messaging or email.
This video demonstrates the process of gathering websites into a collection and sharing that collection into a one note in Microsoft teams.
This is great for sharing all that research work you have done with your colleagues or students.