The First step is to find a useless connection over the web page. Which you understand how to do it? Identify dead one-way links which have additional backlinks. And for locating the backlinks, you can use resources like Ahrefs, SEMrush, and many others. The explanation I check with is https://www.seobyaxy.com/blog/why-link-building-is-important-in-seo-2/