It has been a long time and now I'm finally back to the SEO business again XD.
But anyway, recently I've been told that guest posting/blogging is better and much more popular for link buildings currently. I've also taken a bit research about it and basically I understand it as asking another site owners (blog, newspaper, etc...) to publish my articles, including links point to my ranking site. Of course related sites are necessary to have a quality link; however, I don't think asking other owners to publish my article isn't that easy (unlike what my friend said which sounded too easy to be true).
And so I would like hear some more opinion about it, is it excellent for page ranking and is it hard to do it (I mean it must require some sort of planning right?)?