First of all, we must understand that domain names without www, such as aizhan.com, are top-level domain names, while domain names with www are second-level domain names.
Due to human habits, domain names without www and domain names with www are usually parsed at the same time, and then the 301 without www is redirected to the domain name with www. , to improve user experience.
So we need to know that the domain name with www and the domain name without www are not the same domain name, but they are indeed a website. This leads to a big taboo in SEO: two URL addresses for one page. However, since the webmaster did not declare what the primary domain name is and the weight of the first-level domain name is slightly higher than that of the second-level domain name, the domain name without www is considered to be the main domain name of the website, and the weight and ranking are given to the domain name without www. This results in the ranking without www and the ranking without www. We should determine the preferred domain of the website at the beginning of the website construction to avoid this situation.
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