There are many ways to keep your library clean and tidy, e.g. by keeping your items sorted and easy to find.
1. Use folders
Create a New collection and organise your items by the use of folders. Drag and drop to re-organise.
2. Duplicate items
This is where you find your duplicates. Chose the item you wish to be the master item and tick Merge 2 items. From the window that opens, you can also choose which metadata you want to keep in the retained item by selecting the relevant field.
3. Unfiled items
This is where the items not yet sorted into folders are placed. Go through the list and see if you can place them into an already existing folder.
Notes are a good way to add personal thoughts and information to the items stored in your library. All notes will also be searchable in your library. There are two types of notes:
It is possible to add tags to all items in your library; some items also come with tags already when you import them. Tags are a great way to make your items easy to find once you have a large library.
Zotero can function as a PDF manager. It can download PDF files together with the item metadata, and you can find them and search their contents in Zotero. However, if you use Zotero as a PDF library your free 300 MB storage will shrink quite rapidly.
In order to enable or prevent Zotero from automatically attaching PDF files when importing an item, go to Zotero Preferences > General > File handling > tick/untick Automatically attach associated PDFs […].
If you’re saving files in Zotero, it might be a good idea to check your storage.