How many links are there to SEO novice questions?

Some people may say that exchanging friendship links is a very simple matter. Look at the pr value, industry relevance, collection and link number of the other website, and talk about it the next day. It is true that everyone thinks it is simple, but note that seo is the work that determines the success or failure of details, and the external chain is a very important link. It seems that the chain change process without any technical content hides traps and key details.

1. Cheat link on the program. Even if I see your link on other websites, I can go to your website by clicking on it, but it is useless to your pr value. Why? Because there is no link to you in the code of the source file of the other site's homepage, the search engine spider can't climb your site, let alone take a look at your site. This is what happened to me. I was fooled when I made the ark of the heart. Fortunately, I checked the source file, and there was not even the word "friendly link" in the code. I'm depressed.

Second, pr value, industry relevance, collection quantity, other connection quantity, Baidu snapshot time. These five points are the most basic considerations for chain change. I'll just say it briefly here. Pr value and collection amount: it is good that pr value is consistent. If the value is slightly lower, it is ok as long as Baidu's collection is higher. Industry relevance:

I feel that 60%-70% of the friendly links of a website are industry-related, and the rest are just as long as the pr value is higher, the collection is better and the relevance is slightly better. For example, when I was at the Children's Photography Station in Neverland, I only found some photography websites in other cities, and the rest were children's clothes or children's milk powder. Number of relative links: to

3. Baidu site. Searching for websites and domain names in Baidu mainly depends on whether the homepage of the website is in Baidu homepage and whether it is in the first place. Baidu's home page indicates that the weight is good and stable, and it can be done without Baidu's home page, which will not have much impact. But the main domain name is on the second and third pages of Baidu, and even it can't be found, so goodbye, because there must be something wrong with the other website, either it will be fine in a few days or it will have to wait.

I just have some personal views on link exchange above, please criticize and correct me.