Collections
Collections allows you to organize your library by groups of any kind.
For example, you could choose to group your books by its type, by creating collections such as Manga, Light novels, or Comics; although this is just a suggestion.
A book can only be part of a single collection, so choose wisely what criteria you will be using to create your library collections.
If you also want to categorize a book by multiple criteria, Tags are meant for this usage.
Creating a collection
Collections can be created on the Collections section on the sidebar. Click on New collection and fill the requested information in the dialog, such as the name and description. When you're done, click on Create to finish the process. You will then be redirected to the collection page.

Edit a collection
To edit a collection, open the collection page by clicking on the three dots button in the collections table and then click on Edit. Similar to the creation, you will be asked to edit the same information, name and description. When you're done, click on Save to finish the process.

Delete a collection
To delete a collection, open the collection page by clicking on the three dots button in the collections table and then click on Delete.
DANGER
By deleting a collection, all books that are part of it will be deleted as well, including your read progresses. This action can NOT be undone.