White hat SEO (search engine optimization) is the perfect choice for you if you DO NOT want to risk potentially fatal blows or doing things unethical, and could even get your site banned from Google. In fact, for most companies and businesses it is the only method of search engine optimization you should ever use.
Article Marketing. Unless you have been living in a cave the first thing people learn about white hat seo is article marketing. You are going to create an article with your keywords in your title, description, and have a decent amount of keyword density, and also have your anchored text pointing to your site with your keywords in it.
Forum Marketing. Another thing people commonly do is find a variety of forums that are related to their website and answer questions. They will then leave a link in their signature with their website.
Blog Commenting. Leave quality comments and drop your links in the comment where they are necessary. Leaving nice post, great job, ect. are not good comments. Actually taking the time to read their post and leave an intelligent comment for them (is a great idea).
Link Exchanges. Again, not my favourite, but I guess for some it might work pretty good. Basically, send an email to a webmaster stating that you will add their site on two of your sites in exchange that they will link to your site.
The four above are what I call “basic white hat seo tactics.” Below are more intermediate link building tactics that you should be using.
Guest Blog Post. You can find a lot of places around the net, such as myblogguest.com which is a network of sites and blogs that are looking for guest post. I actually used this method to get in contact with the webmaster here

. You could tailor an article on something pertaining to your site and then leave a backlink to your site for reference.
Video Marketing. Creating videos on YouTube are going really good these days, as well as a handful of other popular video websites. Create a couple videos with your keywords in them and leave a link on your “about you page” and in your description. Most importantly, you can use a number of the free tools on the net to stamp a box on your video with an active link.
Social Media. This is a topic that I could write forever on. Social media could be anything from Twitter, Facebook, MySpace, Orkut, Hi5, or the other 50 million social networks on the internet. For example, on these you would setup fan pages (not on Twitter).
Directory Listing. This is a commonly overlooked tactic that you should be using if you are not already implementing into your seo tactics. There are a handful of great authority directories that you will want to submit your site to, such as, Yahoo directory, DMOZ, JoeAnt, business.com, botw.org, v7v, Aviva directory.