Stop interrupting people and start answering them. The content marketing post makes that case cleanly. Work out what somebody would actually type when they have the problem you solve, write the thing that answers it, then make sure it can be found. Against the rest of the blog, which is mostly about automating links, it is the argument that has aged best.
The backlink posts are honest about why the job exists. Search engines treat a site with nothing pointing at it as suspicious, so excellent content alone will not move you, and building those links by hand takes hours nobody has.
There are reviews of two tools that automate the work, both written by somebody who benefits if you buy them.
A lead generation post covers commenting on relevant blogs rather than paying for names.
Read the content marketing post if you have been buying tools and none of them produced a reader.