Search optimization of sites

As a result of the detailed audit, a number of internal optimization errors were found that were eliminated in the first week of promotion:
A correct robots.txt file has been compiled and added, which has previously been absent in the root of the site.
Optimized download speed of the main page and catalog page
eliminated the main duples characteristic of the online store - pages of sortings, paginations, filters;
The automatically updated map of the site sitemap.xml, which allowed searchers to quickly learn about all the most important pages on the site;
removed bited links in the structure of the site;
All images that weighed enough are loaded and optimized.
Optimized images have not lost their quality.
And a lot of interesting solutions have been introduced on the basis of competitor analysis.