If you hold the bow loose & keep the sight on the spot you shoot at, until the arrow impacts you will come close: unless you have fletching contact or the bow is not tuned.

You can make mistakes in shooting as long as you make the same one every time in precisely the same way.

For tuning you will need help, or be able to understand the info put out on the net or other publications which you can pick up on many of these post here.