Knowing too much knowledge is a dangerous thing, especially when it comes to search engine optimisation (SEO). By constantly searching for new techniques on website promotion you are only likely to effect your website negatively rather than positively which means the time spent discovering new ideas you can try with your website will go to waste when in fact they could go in to creating fresh content and hunting down high quality links to your site.
So why can too much research be bad for SEO? By looking for information available on the Internet you may come across suggestions which are out-dated due to Search Engine Optimisation forever changing. Other information may be untruthful and black hat techniques which will only knock your off the search engine result pages rather than improve your page ranking.
The best way to learn optimisation is to learn from mistakes and watch what people are doing in your niches. By understanding how they approach SEO you are able to do the same for your site which will have the same results as them in the end. The main thing to remember is content and linking is key, by having these under control your website will eventually end up where you want it to be.