2-минутный Правило free backlink
The bigger concern is the inverse—if you don’t engage in any activity that could drive backlinks, you’re giving yourself a very slim chance of improving your search rankings.既然有外部链接，那相对的肯定有内部链接了，内部链接即你自己网站的链接，英文叫做internal link。很多时候你的产品或者文章