What does SEO need to know?

After learning about what SEO is, it may stimulate your interest in SEO. You will ask what to learn about SEO? In fact, SEO is not as mysterious as you think, or as a hacker. To put it simply, SEO requires you to enable a good "communication" between the search engine on the webpage so that the search engine can properly understand your webpage, if no search engine can find your website, let alone rankings. Because each search engine needs to find your website in a certain way, you need to follow certain rules on your webpage, otherwise, it would be like the old saying in China, "no chance to meet or not meet each other". Google's guide to website administrators is a good guide to website construction.
Of course, this is not enough. You must master the following knowledge points:
1. Learn how search engines crawl webpages and how to index webpages
You need to know the basic working principles of some search engines, the differences between different search engines, and how the search robot (SE robot or web crawler) works, how does a search engine sort search results.
2. Meta tag optimization
It mainly includes the subject, Description, and key words ). There are also some other hidden texts such as Author, Category, and Language.
3. How to select keywords and place them on the webpage
Keywords are used for search. Keyword analysis and selection are one of the most important tasks of SEO. First, determine the main keywords for the website (generally in five upper and lower cases), and then optimize these keywords, including the keyword Density (Density), relevance (Relavancy), and Prominency) and so on.
4. Understand major search engines
Although there are thousands of search engines, there are only a few that determine the website traffic. For example, Google, Inktomi, and Altavista are mainly used in English; Baidu and Sohu are used in Chinese. Different search engines have different page crawling, indexing, and sorting rules. We also need to understand the relationship between various search portals and search engines. For example, Yahoo and AOL Web search use Google's search technology, while MSN uses Looksmart and Open Directory technologies.
5. Main Internet directories
Yahoo itself is not a search engine, but a large website Directory, and Open Directory is not. The main difference between Yahoo and search engine is that the website content is collected differently. Directories are manually edited and mainly include the website homepage. The search engine automatically collects directories and captures a large number of content pages in addition to the homepage.
6. Click-based search engines
Search engines also need to make profits. As internet businesses become more and more mature, paid search engines are becoming increasingly popular. The most typical examples are Overture and Baidu, and of course Google's advertising project Google Adwords. More and more people are positioning commercial websites by clicking ads on the search engine. There is also a lot of knowledge about optimization and ranking. You have to learn to get the most clicks with the least advertising investment.