We have to admit that we have never considered the rapid development of the Internet today, the speed and volume of information flow, but now it is really in front of us. How to accept information, how to process and digest them has become a big problem that Internet users need to spend energy to solve.

"A good memory is not as good as a bad pen", our elders always taught us this way when we were young, but this rule may not keep up with the rhythm today. In this era of information explosion, if you want to write down everything you see and hear, there is no time; mechanical memory cannot help you solve the "organization" problem, and learning how to manage information is the kingly way (of course, what is said here "Organization" does not mean Organization). If you are already proficient in search engines, this is already a good start, because you find that using keywords dynamically can find the information you want faster. A keyword is an index marker.

If this is too abstract, let's think about how you classify friends in IM and SNS. First of all, why should we classify them? Second, how to classify?

The purpose of classifying friends is to find him among many contacts faster and save time. In the process of finding contacts, classification plays the role of index, which is a shortcut to help you locate. It's like dividing all contacts by company and school. If you classify company people by circle, you will find that such a division is too general, because you have to always remember what role a certain person is, and relatively speaking, company attributes are more obvious and easy to remember. Needless to say, students, if you want to subdivide it, the school is the best natural attribute. In this way, companies and schools are a kind of index mark.

How are books classified? If you are careful, you may find that "shelf reference: economics" is marked on the corner of many book covers. This is to make the book appear in the appropriate classification system of the bookstore and make it easier for readers to find it. This is the intentional indexing of books by publishers and authors. The process of this classification is: first there is content, and then there is classification. Here we have to think that when writing a blog, the order should be the same. Before the "publishing" is released, give it a "shelf reference". Of course, this reference is the blog's category and tags (Tags). The category is the scope of the article, and the tags (Tags) are the refined content keywords, which are a supplement to the title and help memory. So, tags (Tags) is a kind of index mark.

The attributes of movies (DVD) and songs (CD) (such as publishing companies, directors, actors, singers, song titles, etc.) are enough to identify this product, and then using Tags to label it is not very meaningful to identify this product up. For information with natural attributes, use these attributes as indexes, so as not to "take off your pants and fart-it takes twice".

It is worth mentioning that classification is not only for people to see, but also for machines. Users continue to extract and refine core keywords for the computer to learn, and let the machine do repetitive tasks such as classification and indexing to help users improve efficiency.