If the strategies of external links (backlinks) are much talked about, the internal mesh is a key element that allows, among other things, to increase the authority of your pages.
In addition, it also improves accessibility (a poorly linked page will be harder for visitors to access), helps robots to better understand your site's architecture, especially to locate your most important pages, and distributes page authority and traffic throughout the site.
However, be careful not to fall into the trap of optimizing internal links, because like external links (backlinks), optimizing internal links can be badly perceived by Google and other search engines.
According to the Marketing Definition "internal networking generally refers to the way in which internal links to a website are organized. Internal networking plays a double role. It allows to optimize the navigation within a site and also plays a role in the field of natural referencing / SEO".