If your content are suplicate then Google will not confirm it so always have unique contents

They call them Black Hat Techniques, and yes there is a forum specializing in just this.

I subscribe to the old school slow burn
build of organically building links through
genuine blog comments and meaningful forum posts.

Do Not write Copy-Past any information in Blogs. It must have different to each comment.
do Not create domain name.

SEO tactics may be incorporated into website development and design. The term "search engine friendly" may be used to describe website designs, menus, content management systems, images, videos, shopping carts, and other elements that have been optimized for the purpose of search engine exposure.

Use distinguished and quality contents, go for valid and live links, social networking and bookmarking is good help