I've been talking a lot about fighting games recently, including my own thoughts about Killer Instinct and it's future. One of the big issues I mentioned in that post is the need for more community resources, more outreach, and more knowledge sharing.
Ask, and ye shall receive. One of the most active members of the KI forums has recently posted up a website that does an absolutely fantastic job of explaining Killer Instinct in a way that is relatable to anyone familiar with Street Fighter IV (which by my count is....almost everyone currently following fighting games.)
But even if you're not familiar with SFIV, don't let that necessarily scare you away. Infil does a great job of explaining the ins and outs of KI in relatively plain terms, with helpful rollover callouts for specific jargon.
It's a great resource for anyone who is interested in KI to learn more about it (and a lot of the concepts are general enough to apply across many different fighting games,) so be sure to check it out: