Consider the example of books, but similar and proceed with the files in your computer. We first introduce a general classifier: – art – special profession – sports – Spirituality – Esoteric – books on health – etc. Within each category can be sub-categories For example: Category – Esoteric: – Feng Shui – Numerology – Physiognomy – etc. Similarly, all other categories. Already, this analysis will show you the diversity.. Read More