What links are better to buy to promote the site
Links have always been, are, and will be online. They are the ones who link web documents together. Obviously, this was not as strong as 10 years ago.
And yet the links:
increase the trust of the site;
make the site more recognizable;
affect the ranking of the site in the search;
lead traffic, interested visitors.
Search engines give battle to promote the best technologies, but at the same time, they appreciate high-quality, natural links to a site with good resources, placed in a suitable context.