Easiest way to build backlinks?

[csfarnsworth]

I am working on lancing sites to get projects and my workers are not of that caliper to give each client Info-graphics/Guest blogging.

Other than great great content.Whats the easiest way I can still apply with great care to build backlinks.

-Forum posting on relevant sites with great care.Only relevant areas changing anchortext.

-Blog posts with minimum OBL.

-Web 2.0 properties with unique content.

-Press release with open URL.

-Directory submission on PR sites.

-Article submission on Ezine and other article sites.

-yahoo and other answering sites.

Are these linkbuilding methods still I can use by giving value to others.Not add thanks this this that but working on proper relevant replies adding value.

[irvingw]

avoid directory submissions and article submissions, the other stuff isn't horrible if you're very smart about it.

[csfarnsworth]

Even with a good article approved by ezine or hubpage or ehow with backlink in it is bad?

I am not saying creating an article,spinning it and submitting it to hundred plus sites.A single article with submission to Top Article directories like Ezine,Hubpages.
One article for one Article site.