* Cuaderno: This is the most common and generally accepted translation. It simply means "notebook" or "exercise book," and is suitable for most situations.
* Libreta: This is another common word for notebook, often implying a smaller, more portable notebook.
* Cuaderno de apuntes: This translates to "notebook of notes" and is more specific, implying the book is used for taking notes.
* Cuaderno de composición: This is a more literal translation, but it might sound a bit formal or even unusual in everyday conversation.
For most purposes, cuaderno is the best and safest option.