I think the consensus is pretty much unanimous in the SEO community (that link building is among the most important factors, if not the most important).
A website without any kind of link has NO denmark number for whatsapp chance of positioning whatsoever (speaking of useful SERPs, SERPs that generate requests and profits). Every site needs to create a link with other resources within the network both to connect well, precisely, with the web and, above all, to build its web reputation through the veto placed by an authoritatively better resource than the site that receives it.
Backlinks, therefore, are the real flaw of a newly born website, but also of a navigated site. Yes, because links are born and die for many different reasons (sites close, links are removed, pages are not reachable, etc.).
Google is very clear on the issue of Link Building and does not like at all the purchase of Backlinks, artificial links created on purpose, link schemes, link farms and anything done to mystify its judgment towards the site.
Check all backlinks of a site
With SEMrush Backlink Analysis
According to Google, we should be able to generate Backlinks naturally through human activities, relationships, with a view to sharing and sociality.
We certainly all agree with him, but we also know that, in specific target markets, the possibility of receiving natural inbound links is drastically reduced, indeed, it will never happen!
I don't want to discuss the topic of "how to generate quality backlinks", but I want to shed light on the importance that backlinks have for the resource to be positioned. The requirements that backlinks must have to influence the ranking of a site or specific page on Google are:
The number of Links
The quality of the links
No Follow / Do Follow attributes
The anchor text
Relevance;
The quality and relevance of the Landing Page.
If we receive a link with these characteristics then it is an excellent backlink that will positively influence the organic positioning of the site because backlinks are truly a ranking factor !