Before you do anything, and this is key, you need to know what makes your company unique. You need to have a clear concept of the mission of your company. You need to determine exactly what you have to offer because that’s what’s going to make you rank. It’s that simple. SEO is just like regular business. If you’re doing everything on the same or inferior level as your competition, you’re not going to stand out. If you’re not the best result, why should people want to find you? Why should Google rank you? This seems simple, but this factor is often forgotten.
To prevent users from linking to one version of a URL and others linking to a different version (this could split the reputation of that content between the URLs), focus on using and referring to one URL in the structure and internal linking of your pages. If you do find that people are accessing the same content through multiple URLs, setting up a 301 redirect32 from non-preferred URLs to the dominant URL is a good solution for this. You may also use canonical URL or use the rel="canonical"33 link element if you cannot redirect.
Big sites can rank for the most general terms. Smaller sites within a very specific niche can do the same. Of course, it’s also easier if you’re writing in a language that is not spoken all over the world. For most smaller sites that are writing in English, however, the general rule of thumb is this: start with a big set of long tail keywords which have little traffic, but you can rank for more easily. Then, work yourself up to the rankings step-by-step. Once you’ve gained some SEO authority, start optimizing for more general keywords. And in the end, maybe you will even be able to rank for your head keywords!
It's wonderful to deal with keywords that have 50,000 searches a month, or even 5,000 searches a month, but in reality, these popular search terms only make up a fraction of all searches performed on the web. In fact, keywords with very high search volumes may even indicate ambiguous intent, which, if you target these terms, it could put you at risk for drawing visitors to your site whose goals don't match the content your page provides.