Recently I spent a lot of time looking up competitors in major search engines. If you haven't done a lot of web design, the title is that line of text that appears in a little box at the top or bottom of your browser. It goes in the HTML code near the top of your page. I don't capitalize the K in keyword. Search engines will match the way you write the word to the way users type the word when they're searching for you.
Most people search using terms typed in all small letters.