Seo first Knowledge

I think the search tools used by most Chinese people are Baidu. Even we often Google Baidu, Baidu, or Google for a while, or even after Google arrives at Baidu, the website jumps to Google, but now Google has withdrawn from the Chinese market, so the domestic search engine is still the only one in Baidu, so the competition between the two companies will not be discussed, after all, it is far away from us.

I think everyone, no matter what social identities or job positions, can't do without the Internet, can't do without the search engine, and can't understand anything, will subconsciously use the search engine, Baidu knows, wikipedia and so on to query the information you want. If you enter a keyword or keyword at will, there will always be many web pages that appear under our search results. Now there is a problem, we usually click the first webpage, right, why? This is a habit, or a subconscious reaction. The subconscious thinks that the reliability of the top websites is higher than that of others. Of course, you will also find that the website you searched for is indeed in a single position. Hey hey, but someone else paid Baidu promotion fee, so you know ....

For our front-end engineers, what we need to do is to make our websites rank higher and better on the search engine. Here is a professional term SEO.

Let's talk about the search engine. The search engine seems to be using a spider program. Its basic working principle is mainly two:

1: Search Engines send "Spider" programs to search Internet sites along known links. Once a new website is found, it automatically extracts the website information and adds the website to the search engine database. 2: The website owner can also submit the website to the search engine. The "Spider" program will scan your website and store the information in the database for user query. What is Seo? Seo is search engine optimization, also called search engine ranking and website optimization. Its English name is search engine optimization, which is abbreviated as Seo. Seo makes the website design conform to the search engine search habits, so as to improve the ranking of the website in the search engine, so that potential customers can search for the website on all major search engines through product keywords, improve the network marketing effect. Why we need Seo?

1: search engines are the main tool for Internet users to obtain information.

2: search engines are efficient network promotion channels

3: Netizens trust natural search results more

4: Internet users generally only view top search results

What can Seo do?

1: Improve the search ranking of websites -------- Seo by studying the crawling and retrieval rules of search engines, so that product websites can adapt to these rules and get a good search ranking.

2: bringing more high-quality traffic -------- Seo can bring visitors with clear needs, greatly improving the marketing effect of the website.

3: optimizing the quality of website construction --------- through Seo, you can make the website page, architecture, and level clearer and more reasonable, more in line with the use habits of ordinary Internet users

　Search engine ranking rules

　　　　The search engine ranks the websites that meet users' search requirements before the search results.

A search engine uses a series of complex algorithms to rate and rank each website.

Based on experience, we can find that search engines generally evaluate websites in three ways. 1: website popularity-websites that are widely connected on the Internet have a high click rate. 2: Relevance of websites-the content and themes of websites are closely related to keywords searched by users. 3: quality of the website-the website has a large volume of visits, many original content, and the page update speed is fast ...... Base of ranking: webpage level (PR value) 　　 Keyword relevance 1: The Search Engine evaluates the topic content Keywords of each web page. 2: Calculate the relevance between the webpage and the keywords queried by the user. 3: the higher the relevance, the chance to rank first. Website Quality Assessment 　　　　Search engines are recommended for websites that meet users' search requirements and have high website quality. Websites with valuable access: indexed pages with multiple website views large website click-through rate high original content multi-page update speed fast domain name history long websites with good access experience: high page opening speed (server and bandwidth ). No vicious plug-in internal links are available. There are website maps and clear website navigation. Seo core: Keyword strategy 1. Website Analysis What products and services are provided by the website, and what keywords can users search for our website? 2: Confirm core keywords 　　　　　　Keywords that are highly relevant to WebSite Services and have a high conversion rate. Frequently Used by product users, keywords with high search times are easy to rank, avoiding popular competition keywords. 3: Combine long tail keywords Form a series of keyword groups based on users' search habits and combinations and extensions 4. Keyword promotion strategies 　　　　　　A general homepage is used to promote the core keywords and keyword groups. Create more secondary websites and optimize long tail keywords one by one. Keyword density:

Keyword density refers to the frequency of keyword appearance on the page.

Calculation formula: keyword density = number of keywords/number of all words on the page. The keyword density is too high. Fraud is suspected. If the keyword density is too low, the optimization effect cannot be achieved. The density is generally between 2% and 6%, Which is suitable. Keyword distribution: 1: The title and meta tags of the page 2: article title, page header, left side, First 200 words of Body 3: bold, increase, color, and link 4: IMG alt tag 5: English or pinyin with keywords in the website Website link policy: 　Websites with extensive links on the Internet are recommended by search engines. All the subpages in the website have links to the home page. Keyword text appears on the page, which can be used to link pages with related topics. Clear website navigation with breadcrumbs navigation. Create a website map that displays all the content of the website. Try to interconnect all important pages on the site. Use text links as much as possible, and use less images and flash links. Do not expose your website to dead links. Introduce high-quality external links: Submit your website to search engine directories. Submit the website to the related directory of the industry website. Links with high-quality (PR and traffic) competitor websites. Links with high-quality partner websites. Publish soft texts with links to important industry websites. Do not make some spam links: Send URLs in batches in forums, message books, etc. Website Construction Optimization:Use a high-performance and stable server to avoid the same server or an IP field as the spam website. The Design of domain names and URLs should be related to the promotion keywords. For example, use English or Chinese pinyin. The promotion of Long Tail keywords should be considered in the planning of website columns. A wide range of original content is released. search engines will give priority to original websites. Webpage optimization:Try to use DIV-CSS to make Web code concise. In this way, the page is opened quickly, and it is convenient for the Spider Program to catch it. If the page has a Java Script, you can place the script at the end of the page or call the JS file. In this way, the keywords can be concentrated at the front of the webpage code as much as possible. Try to use a static website as much as possible to prevent important topics from having? , &, =, And % dynamic URLs. Avoid pointing different links to website pages. Search Engines generally evaluate PR for different link addresses separately. Do not use dynamic addresses. Try to include only one parameter. The more parameters, the more difficult the search engine is to capture. Image optimization:Use less or use less flash. Adds the alt attribute to each image on your website to identify the image topic. Important pictures prevent the picture subject from being consistent with the page topic on the homepage or key topic. Do not cheat and avoid being punished 　　　　Seo must understand the rules to avoid unintentional use of these methods, and the search engine is punished. Keyword stuffing hiding a doorway pages useless meta tag (useless meta tags) cloaked page) link farms redirection (re-direct) to do white hat SEO, do not do black hat SEO. Common SEO toolsCompound search: http://www.gogou.org multiple search engines comparative search http://www.baigoogledu.com Gg/Baidu comparative search keyword analysis http://www2.baidu.com/inquire/rsquery.php extended keywords http://index.baidu.com/Baidu index https://adwords.google.com/select/KeywordToolExternal http://ww.google.com/trends/ keywords query heat http://tool.chinaz.com/Seo/Key_Density.asp keyword density query tool http://tool.chinaz.com/Rank/Index.asp PR query http://www.alexa.com/#traffic traffic query http://tool.admin5.com/grasp.html indexed and reverse link query Relationship between HTML5 semantics and Seo In HTML5, a series of tags are semantically defined, such as the navigation Nav, theard, tbody, and tfoot tags in the table ..... the tag semantics of HTML5 greatly enhances code readability and maintainability. It also satisfies Seo rules. The Semantics of HTML5 is conducive to search engines and code reading. As a front-end developer, we must understand the SEO rules and HTML specifications and write code that can be understood by people, rather than the code that only machines can understand. Fighting man !!!!