Keyword density is one of the criteria for search engines to judge whether the page content is related to the keywords you have placed.
To give a simple example: If your page has a total of 1000 bytes (excluding html code) and the "keyword" belongs to 5 bytes, and appears 6 times in the page, then your keyword density is 6 *5/1000=3%.
When the search engine is not very mature, many websites hide keywords in invisible places or use the same color as the background. The reason why these most primitive cheating methods are useful is that they enhance the keyword's suitability.
Of course, this method is now outdated and telemarketing list easily recognized by search engines. Therefore, when we do a website, we must adjust the keyword density. A common saying on the Internet is that the keyword density is best controlled within 2%-8%. If you are a serious person, you may say that the density of others 1%, 12% of the density of people ranking is equally good, it can be said that any SEO experiment can come up with a counter-example to prove that it is not established. So there's no need to be serious, since everyone says it's best to stay within this range, just follow it.
If you have the opportunity, you can also do experiments yourself and find out the truth. Generally speaking, it is best to control the density of new sites within 3%. If it is too low, it is easy to reduce the correlation. If it is too high, the review period will be too long (only for Baidu). Not good for new site rankings.
For keyword layout, there are also many sayings on the Internet. Usually the most recognized and recognized layout places are two: one is the top and bottom of the page, and the other is the upper left corner.
And I personally think that the most ideal layout method is: top + bottom + upper left corner + scattered each corner.
The keywords appear concentrated at the top, bottom, and upper left corner, and appear scattered in each corner. A simple sentence: centralized + decentralized. You can also experiment with this by yourself, the main thing is to have the awareness of this keyword layout first. And then continue to adjust to achieve the best results.
Relevance of keywords
What is correlation? If search engines simply rely on keyword density and layout to determine whether your site is relevant, the phenomenon of cheating may be very serious, and there will be many sites with nothing to say.
Therefore, after judging the basic keyword density, the next step search engines usually look at whether your site is related to the keyword. For example: If I want to do the word "SEO training", then my first step is to completely match the word "SEO training", increase the keyword density, and then use other related words to improve the relevance of the main keyword .
So what is associated with this term? Yuan Shuai only makes a simple analysis here. The word "SEO" can be used to increase relevance with a statement that restricts the description of the region, or an industry qualifier. This is also a commonly used method for mining long tail words.
Attachment: Search engine Baidu update cycle
According to statistics: The major update times included in Baidu are the 11th and 26th of each month, especially the 26th, the update range is the largest, and the K station is also the most. Baidu small update time: every Thursday. Update time is at 4:00 am. It is usually updated at 4:00 in the morning, and some are updated after 9:00 in the morning. It has no effect on website traffic. Only at noon, after Baidu readjusts the website's keyword search, will there be a big change in traffic. Natural traffic increases and naturally decreases.
According to the latest observation and analysis, the Baidu update time is roughly: 2 times a month. Of course, the current Baidu update frequency is not like before. There are rules to follow, and fluctuations are unstable and frequent. fundamental.