When I was just discovering the advantages of online writing, I wrote for a web site called Experts Column, which specializes in getting contributors to write SEO-oriented articles.
The site was in its experimental stage back then, and unfortunately, it had to shut down operations temporarily to undergo a reformat. However, it was a good place for me to hone my writing skills, train myself to meet deadlines, and figure out how SEO works.
I have selected several of my articles for freelancers who aspire to turn writing into a career. Again, the following is not an exhaustive guide, but just a run-down of the basics to get you started on the right path: