chicagolimo

I wish someone would tell the spammers that!

Guest posting is off page strategy of SEO. In that, you just write the good quality post and submit or send to some related sites with 2 or 3 backlinks of your site. So, it is called link building in natural way. That you don't have to pay for it.

Guest blogging is really best, but it may take too long time. See if you can link exchange with some other websites.
 
There is a lot of information on the topic online. Check moz.com for example.

Guest blogging is the best way for getting quality back links . You just have to write a quailty content and than share in your niche .

There is a limited way of getting immediate backlinks that are quite good. That being searching for industry specific directories with a good page rank on their inner pages (not too many of those around). Maybe contact non competing but related websites and see if they will do a mutually beneficial link exchange (you will be unsuccessful in most cases).
 
Then really its down to creating something people will actually want to link to and promoting it through social media sites, such as Twitter or Facebook. You could also become a guest blogger if you could find a decent website that is looking for one in your industry.
 
Getting backlinks is really, really difficult and in most cases its not quick. Good luck and I hope you do well.

i think tracking competitor baclinks using moz and ahrefs is the best solution as we can get new and quality sites daily.