As UX designers, we should go out there and collect as much data as possible before building a real product. This data will help us to create a solid product that users will want to use, rather than a product we want or imagine. These kinds of products are more likely to succeed in the market. Competitive analysis is one of the ways to get this data and to create a user-friendly product.
The errors in technical SEO are often not obvious, and therefore one of the most popular. Mistakes in robots.txt and 404 pages, pagination and canonical URLs, hreflang tags and 301 redirects, http vs https and www vs non www versions: each of them can seriously spoil all efforts to promote the site. One quality SEO website analysis is enough to solve all the main problems in this part forever.