The first tool I use for SEO on any website is SiteGuru. It's the easiest to use SEO software I've ever seen. It helps you get your feet wet with the basics in a way that is easy-to-understand and makes sense, and it does it in a brilliantly simple interface. After all, if you can't explain it simply, then you don't understand it well enough. SiteGuru makes it ridiculously easy for you to do that which needs to be done as soon as possible.

It cuts through all that "fluff" which makes you feel overwhelmed and confused, and helps you quickly do the simple, but important things first, and get them out of your way, so you can achieve your goals faster.

With SiteGuru you will quickly fix the most important aspects of on-page SEO, which is critical for your site before you even think about off-page optimization, so you can get quick wins and move on to other, more complex tasks.