what would make up the other 2/3 bryant, i'm assuming your signature is 1/3 sky, 1/3 concrete, 1/3 truck? tryn to better myself also
It's not about necessarily splitting the frame into thirds and filling each third with something, it's about placing your subject on one of the "thirds lines".
Take this shot for example:
Sunrise in Lavallette, NJ by
Dan Valanzola, on Flickr
If you superimpose some lines splitting it into thirds vertically and horizontally, you can see that the sun is almost at the intersection of the left and bottom lines, and the horizon is almost exactly on the bottom third line.
Now take it cropped like this:
Still not a bad shot, but with the horizon and sun both dead center in the frame, it's just... blah. It's boring.
Basically, if you put something dead center in the frame, the shot will be a bit boring.
This isn't always the case though. Take the motorcycle shot I posted yesterday. The bike is pretty much dead center in the frame, but the grass, trees, and sky split it into thirds horizontally, and all three are at different depths. It's not the most creative composition by any means, but for a straight on profile shot, it works.
No photography rules apply all the time, but a lot of the time they will help you compose a more interesting shot.