How to write effective alt descriptions?

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Be concise and to the point: Alt text should be short but at the same time accurately describe the content of the image.
Use relevant keywords: Include keywords in the alt text that are related to the content of the page and image.
Don't repeat the headline: Alt text shouldn't just be a copy of the headline. It should add additional value.
Describe the image's function: If the image has a function (e.g. a "Buy" button), state this in the alt text.
Don't start with "image" or "photo": Search engines already know it's an image.
Avoid keywords: Don't force portugal mobile database keywords in unless they make sense in the context of the image.
For images with text: If there is text in the image, rewrite it in the alt text.
For decorative images: If the image has no informational value, use empty alt text or a very general description (e.g. "Decorative image").
Technical elements of on-page SEO
They refer to the invisible elements that search engines use to understand your site and its environment.

The technical elements of on-page SEO are the foundation for search engines like Google to properly index your pages and display them in search results. They focus on the technical aspects of your website that directly affect how well your pages are understandable to search bots.

URL structure:
URL structure plays an important role in search engine optimization and user experience. It is recommended to use descriptive and short URLs that clearly reflect the content of the page and are easy to remember. Avoid dynamic URLs with long strings of characters unless necessary, as they can be difficult to read for both users and search engines. Instead, use permanent links (permalinks), which are permanent and clear, which improves navigation and the overall structure of the site.