Ahrefs is also a good one. Yeah, I know and I am not talking about the tool, there is also a blog which features good actionable data driven content.
Another one will be "Robbie Richards" blog. Its not specifically a backlink or link building guide blog. But it provides useful information about online marketing strategies that you can use in the present day life.
Another one will be "Robbie Richards" blog. Its not specifically a backlink or link building guide blog. But it provides useful information about online marketing strategies that you can use in the present day life.