Rule of Third

[Big Mike]

Another thing to consider, is that the ROT points may change when you crop your image to different sizes/ratios. So while using the viewfinder will work for an output of a 2:3 print...you may eventually crop the image and that point may no longer fit the ROT.
So while it's certainly a good idea to think about your composition while shooting....don't be afraid to change or reconsider it in the post processing stage, and it may help if you leave yourself a bit more room/space when shooting.

 

[Lee_Maryland]

Thank you Mike, you have been a big help for me.