What are the practices of SEO'ing individual articles and individual blog posts that have your keywords that link to your main site? Do people SEO their articles and blog posts to pass on link juice to their main website they are SEO'ing? Sorta like promiting 2nd tier links? Is it worth the time?
Not exactly, and it depends on the niche. You will want to tag certain keywords \\you are targeting if you can, but this all depends on which way you go about optimzing your site, what niche you are, etc.