You can also choose a library, but there is a big difference between public worksheets and worksheets in a library. Public worksheets can be filled in immediately, but worksheets in a library must be copied first, which also takes up storage space (more precisely, the assignments in the worksheet take up storage space). Copying gives you full access to the worksheet, so you can edit and complete it (only registered users can copy worksheets from a library). If you are a student and do not want to deal with editing worksheets, you should search for public worksheets. Completing these worksheets does not take up storage space, unlike worksheets copied from a library.