The position of the keyboard on the work surface is important as it influences the posture of the entire body.
The keyboard should be central and close enough to the user so they don’t have to reach forward to use it.

It is recommended that the alphabetic section of the keyboard be positioned directly in front of the user.
The G and H keys are usually considered the centre of the keyboard and these should be aligned with the midline of the body (in front of the nose).

Remember “H and G are the Central keys”