To select data from an e-commerce website and identify products that give maximum sales for SEO (Search Engine Optimization), you need to follow these steps:

1. Data Collection:
a. Access your e-commerce website’s data: Gather data on all the products available on your website. This may include product names, descriptions, prices, categories, images, customer reviews, ratings, and sales data.
b. Collect keyword data: Use keyword research tools to find relevant search terms that users are using to search for products similar to yours. These tools can provide insights into popular and high-volume keywords.

2. Analyze Sales Data:
a. Identify top-selling products: Analyze your sales data to identify products that have consistently high sales numbers. These are the products that have demonstrated their popularity with customers.
b. Calculate ROI: Consider the profitability of each product by factoring in the cost of production, marketing, and other expenses. Focus on products that not only generate high sales but also have a good profit margin.

3. Keyword Analysis:
a. Map keywords to products: Match the keyword data you collected earlier with the product data to see which products are most relevant to popular search terms.
b. Identify keyword opportunities: Look for keywords that have high search volumes but low competition. Targeting these keywords in your SEO strategy can help you rank higher in search results.

4. On-Page SEO Optimization:
a. Optimize product pages: Use the identified keywords to optimize the product titles, descriptions, and meta tags. Ensure that the content is well-written, relevant, and informative.
b. Optimize product images: Use descriptive alt tags for product images to improve their visibility in image search results.

5. Technical SEO:
a. Ensure mobile-friendliness: Make sure your website is optimized for mobile devices, as a significant portion of e-commerce traffic comes from mobile users.
b. Improve page load speed: Faster loading pages are favored by search engines and improve user experience.
c. Implement structured data: Use schema markup to provide search engines with additional information about your products, which can enhance your search listings with rich snippets.

6. Content Marketing:
a. Create high-quality content: Develop valuable and shareable content related to your top-selling products. This could include blog posts, guides, tutorials, and videos.
b. Promote on social media: Share your content on social media platforms to increase its visibility and reach.

7. Monitor and Analyze:
a. Track performance: Use analytics tools to monitor the performance of your optimized product pages and content.
b. Adjust strategies: Continuously refine your SEO strategies based on the data and insights you gather. Adapt to changing consumer behaviors and search trends.

Remember that SEO is an ongoing process, and it may take time to see significant results. By focusing on products with a proven sales record and aligning your SEO efforts with keyword opportunities, you increase your chances of achieving better rankings and attracting more organic traffic to your e-commerce website.