Link building is important if you truly want to succeed with your web site. Quality link building easily directs traffic to your site that makes things possible for you, especially if you are running a business site.
There are ways to make sure that you get good back links. One is article marketing, where you simply write an article about your products, services, or businesses and show them to the top article submission web sites. Those directories should be able to give you around 3 links to use.
You could also get into Web 2.0 sites as they are all about user generated contents. By taking advantage of those sites, you get to have your links for free.
Press releases are also a good way to do it. you get to expose your business and lead visitors to your website. Tons of press release sites are out there for free. Just look around and you are bound to find one.
Social networks like Facebook and Twitter are also good to use when linking. They can easily help you generate huge amount of traffic and it can also be fun since you are indeed socializing with other people in the Internet who you could possibly convert into your customers.