1.Introduction SEO

1. What is SEO?

Search Engine Optimization (SEO) refers to the technology of improving website rankings in various browser searches. It’s a complex discipline that blends technology, content, user experience, and marketing. The core of SEO is to understand how search engines work and understand what users will search for, and optimize the website accordingly to meet the needs of search engines and users.

Specifically, SEO includes:

Technical optimization: Ensure the website has a clear structure, fast loading speed, and adaptability to various devices.

* Content Optimization: Create high-quality, relevant and valuable content.

* User experience optimization: Provide intuitive navigation and attractive interface design to increase user engagement and dwell time.

* External optimization: Establish high-quality external links.

But is the goal of SEO to improve rankings and traffic? That’s just the first step.

1. Improve quality traffic: Not only increasing visits, but more importantly, attracting users who are truly interested in your products or services.

2. Improve conversion rate: By optimizing landing pages and user journeys, increase the rate of visitors converting into customers.

3. Build brand authority: Consistent exposure in search results can enhance brand recognition and trust.

4. Provide excellent user experience: SEO is inseparable from user experience, and good SEO practices can significantly improve user satisfaction.

5. Data driven: SEO provides valuable user behavior data that can guide the overall marketing strategy.

2. Importance of SEO

1. Increase high-quality website traffic: SEO not only increases traffic, but more importantly, brings highly relevant visitors. According to research from BrightEdge, organic searches account for 53% of all website traffic.

2. Increase brand credibility and authority: High search rankings not only increase visibility but also build brand authority. Data from Advanced Web Ranking shows that the click through rate (CTR) of the first search result is an average of 31.7%, while the tenth result is only 3.09%.

3. User experience: Google’s page experience update emphasizes the importance of user experience in SEO. For example, according to Google, when page load time increases from 1 second to 3 seconds, the bounce rate increases by 32%. Optimizing website speed not only improves SEO, but also directly affects user satisfaction and conversion rates.

4. Significant ROI: Although the initial investment in SEO is relatively large, the long-term ROI is definitely better than other growth channels.

3. How search engines work

3.1 Core components of search engine

The three core components of a search engine - crawlers, indexes and algorithms - work together to deliver the most relevant search results:

1. Crawler: Also known as a spider or robot, it is responsible for discovering and collecting web page information.

2. Index: A large database that stores and organizes information collected by crawlers.

3. Algorithm: Determine which pages are most relevant and should be ranked first in search results.

3.2 How search engine crawlers work

The crawler works through the following steps:

1. Start crawling from a list of known URLs.

2. Analyze the content and link structure of these pages.

3. Add newly discovered links to the to-be-crawled list.

4. Continue to crawl new pages based on priority.

In the web page we can provide these files to guide the crawler:

• robots.txt file: This file is located in the root directory of the website and instructs crawlers which pages can be accessed and which cannot. For example: