Many times when standing on the tee it is difficult to pick an aim line. This is especially true with doglegs, downhill holes and those holes where you can't see the landing area.
To overcome this, and get your attention off the ground, pick a concrete object on the horizon to aim at. It can be a tree, a house, of anything else that stands out in the distance.
This gives you a good aim line regardless of the situation. Once you have that object identified, it is easy to pick your intermediate target when you are standing directly on the line behind the ball. All that is left is to line up to it and go.
It doesn't matter how straight you hit the ball if you are not lined up correctly. Often the tees are lined up to put you in the woods. Never trust them or use them for your alignment.
Next time you get to that hole you never seem to hit the fairway on, think about this little tip and aim for the trees.