the right button is a toggle for the autofocus. When it has the grid icon (like on your image), it means it is defaulting to multi point autofocus. If you are able to click it and toggle it, the other option is center point autofocus. I am not well versed enough in photography to explain the difference between the 2.
For the left button, that toggles something called metering. The 3 options are: matrix (what your camera is showing in the image), spot, and center-weighted. Again, I don't know enough to explain the difference. I typically don't use pro-mode, although pro mode did come in handy when i was taking pictures of a partial solar eclipse last year.