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I think Link Exchange and Forum Posting are the very good tactics for building link...

I prefer blog Posting, forums & Bookmarking these are the best strategies

SEO can make the content of your web pages more relevant, more attractive, and more easily read by search engines and their crawling and indexing software..

Relevancy and quality matters alot..

offsite and onsite is important for seo .

SEO stands for Search Engine Optimization. This is the process of structuring a web page so that it is found, read, and indexed by search engines in the most effective manner possible. This makes your web site and its content attractive, relevant and visible to search engines and web searchers.

I'd give or take separately from smearing not the same SEO methods, operational application of these methods are equal if not extra vital when it comes to SEO.