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Complete SEO Optimization Guide
1. SEO Basics and Importance
SEO (Search Engine Optimization) is a technique to increase website visibility in search engines. Search engines like Google, Naver, and Bing consider over 200 ranking factors to sort results. Organic search traffic is more cost-effective than paid advertising, with the top 3 results capturing 75% of all clicks. SEO divides into On-Page SEO (internal page optimization), Off-Page SEO (backlinks), and Technical SEO (site structure), each affecting search rankings. Good SEO leads to increased traffic, improved brand awareness, and higher conversion rates.
2. On-Page Optimization Strategy
On-Page SEO optimizes internal page elements. Title tags should be 50-60 characters with keywords placed at the front, and use only one H1 per page. Meta descriptions should be 120-160 characters to encourage clicks, and URLs should be short and include keywords. Images should have descriptive alt attributes, and internal links strengthen inter-page connections. Content should be at least 300 words with 1-2% keyword density, and LSI (Latent Semantic Indexing) keywords increase relevance. Providing structured data with Schema.org markup displays rich snippets.
3. Meta Tag Importance
Meta tags convey page information to search engines and users. Title tags have the biggest impact on search result click-through rate (CTR); add brand name at the end (e.g., "SEO Guide | UtilMonster"). Description tags are not direct ranking factors but attractive descriptions increase CTR, indirectly improving rankings. Keywords tags are ignored by Google but still referenced by Naver. Optimize social media sharing with Open Graph (og:) and Twitter Card tags, and prevent duplicate content issues with Canonical tags.
4. Keyword Optimization Methods
Keyword research is the starting point of SEO. Analyze search volume and competition with Google Keyword Planner, Ahrefs, or SEMrush. Long-tail keywords (3-5 words) have low competition and high conversion rates. Include keywords naturally in title, H1, first 100 words, meta description, and URL, avoiding keyword stuffing (excessive repetition). Use synonyms and related keywords for semantic search, and create content matching user intent (informational, navigational, transactional). Use Google Search Console to check actual search queries and optimize.
5. Mobile-Friendliness and Page Speed
Google uses Mobile-First Indexing, making mobile optimization essential. Use responsive web design for all devices and set touch targets to minimum 48x48px. Page speed is measured by Core Web Vitals: LCP (Largest Contentful Paint) should be under 2.5 seconds, FID (First Input Delay) under 100ms, and CLS (Cumulative Layout Shift) under 0.1. Improve speed with image compression (WebP), lazy loading, CDN usage, and code minification. Check scores with Google PageSpeed Insights and apply recommendations.
6. Page Speed Impact on SEO
Page speed affects both search rankings and user experience. When loading time increases from 1 to 3 seconds, bounce rate increases by 32%, reaching 90% at 5 seconds. Google uses page speed as a direct ranking factor, and slow pages have lower crawling frequency. Improvement methods include reducing server response time (TTFB), enabling browser caching, optimizing JavaScript/CSS, image optimization, and applying AMP (Accelerated Mobile Pages). Monitor performance with Lighthouse and GTmetrix for continuous improvement.