SEO (Search Engine Optimization) is the process of improving a site's visibility in search engines. A frontend developer can do a lot to improve the SEO ranking of his site. Here are some basic aspects to pay attention to:

- Site load speed. Search engines evaluate how quickly your site loads and how it affects the user experience. You can use tools such as code minification and compression, image optimization, caching, and CDNs (Content Delivery Network) to speed up site loading.
- Adaptive design. Your site should display well on different devices and screen resolutions. Not only will this improve the user experience, but it will also increase your site's ranking in mobile searches. You can use techniques such as media queries, flexbox, and grid to create an adaptive design.
- Semantic markup. You should use the right HTML tags to structure the content on your site. This will help search engines understand the meaning and purpose of your content and index it accordingly. You should also use meta tags to specify the title, description and keywords of your site.
- Link Profile. You should make sure that other authoritative and relevant resources link to your site. This will increase the credibility of your site and improve its position in search. You should also avoid broken links and redirects on your site, as they can have a negative impact on SEO.