I'm extremely wary of link-building techniques these days as I don't want it to have a negative effect on my website. 
Years ago when I first started creating websites and trying to get a high Google Page Rank, everyone was intent on submitting their websites to link directories. 
Do people still do that? Is it beneficial at all, or are they seen as low-quality links? 
What about blog comments, and forum signature links? Are they still a good option?
All I am really doing at the moment is trying to work on quality content and social media marketing, but I would love some other options to give my backlinks a boost!