Advice For Novice?

Hey r/cycling. I'm fairly new to the idea of cycling, and I'd like to purchase a bike to train for the idea of an upcoming triathlon. My price point is around $500. I really have no clue what I'm looking for except for the idea that I need a road bike.

I found this one on Kijiji: http://www.kijiji.ca/v-road-bike/oshawa-durham-region/road-bike-viner-62cm-columbus-frame/1271955563?enableSearchNavigationFlag=true

Is it worth it? Any help would be greatly appreciated.

Thanks and sorry for formatting (I'm in mobile)