The Life-Changing Magic of Tidying Up: The Japanese Art of Decluttering and Organizing (The Life Changing Magic of Tidying Up)

I recommend you throw out anything that does not fall into one of three categories: currently in use, needed for a limited period of time, and must be kept indefinitely.

IT IS CRUCIAL not only to tidy by category but also to follow the correct order, which is clothes, books, papers, komono (miscellany), and finally, sentimental items.

Keep only those for which there is a clear purpose – those you are currently using, those you will need for a limited period and those that you need to keep indefinitely.