Theme Horse

I have created 3 columns underneath my main text area on each page of my site.
I did this with <div class=”one-third”> info here </div> in the text tab of the Edit Page window.
Is this the correct way to achieve 3 col. of info?
Or is using widgets the way to do it?
If the best way is with widgets is there deeper documentation on how to use widgets?
It seems like going to Theme Instructions, that documentation is pretty minimal.
thank you!
Here is my site:
http://192.145.238.144/~insigh53/