One of the main tasks of SEO is to continually review your progress, and implement adjustments as necessary. Before any SEO adjustments are made, there should be an understanding of what your website's goals are. This process begins by taking an inventory before the first SEO results, which must be repeated regularly later. Here, special SEO indicators are used which provide information about the success of the adjustments. Key SEO metrics include target keyword ranking and visibility indexes that summarize rankings for different keywords and convert them into a single value.