The super detailed explanation of nofollow and dofollow comes from an article online, authored by fashion on the seowhy forum. If you are the author, please leave a comment; Guo Jian would be very glad to meet you!
This article provides 2 small tools (the part marked in dark red).
While browsing online, I noticed that webmasters nowadays are different from those a few years ago. When it comes to SEO, they all have their own sets of methods. In terms of building backlinks, they can be ruthless, leaving URL links wherever they see a chance to comment. Many blogs are filled with piles of spam comments, just for the sake of having their name linked to their website. This practice itself is not wrong. If you're running a Chinese website, you can continue doing this. However, this site specifically discusses English websites. If you're managing an English website and don't pay attention to the nofollow issue, you'll waste a lot of effort unnecessarily. Time is money for webmasters. If you're purchasing backlinks, you should also be particularly mindful of whether the other party has set nofollow, so as not to waste your money.
Backlinks, known in English as backlinks, refer to links pointing from other sites to your own site. Those who have studied SEO know that search engines consider a link from another site to yours as a vote for your site, increasing its importance. This helps improve your site's PR value and boosts its ranking in search engines. Therefore, the more backlinks, the better. (Of course, this isn't absolute. Practical experience has shown that if you only build backlinks on PR0 websites, even if you create millions of links, your site won't exceed PR1. A single backlink from a high PR site is worth more than n backlinks from low PR sites. This topic is beyond the scope of today's discussion). So, many webmasters blindly post replies on others' blogs, actually wasting quite a bit of time. Where does the problem lie?