In recent years, SEO has gone through many tumultuous changes. From the Panda update which uprooted many sites to the implementation of social metrics, it's clear that SEO ranking factors aren't staying stagnant. However, in spite of all these changes, the underlying fundamentals of SEO haven't changed.
These immutable fundamentals have been the same from the early days of SEO until now. In fact, they've only become more and more important as search engines have gotten smarter and smarter.
These are the four immutable laws of SEO.

Law #1: Content Is King
Google's goal since day one has been to help the best content on the web find its way to the top of the search engines. As Google gets smarter, it's only going to do this better and better.
Trying to game the system is not a very good long-term strategy. It's extremely, extremely rare for people to be able to game search engines for any real length of time.
Instead, the best way to get ranked in the long run is to provide content that people genuinely like and want to share. This will generate organic backlinks, which Google loves.

Law #2: Think Long Term
Short-term SEO thinking is not only ineffective, it's also extremely unhealthy.
People who try to get ranked in weeks rather than months inevitably get burned.
The methods you employ when you're thinking long term versus short term are different. In the long run, you'll lay much more solid foundations with long-term thinking than if you were just trying to get ranked as fast as possible.
Get in the habit of thinking in six months to a year in terms of your SEO goals.

For more information and reading visit:
http://onlinemarketinggenie..com/2013/07/4-immutable-seo-fundamentals-you-must.html