This should be either about one metre from the left curb or the centre of your lane if your lane is narrow. The reason that it’s set as one metre from the curb is that a metre is the average width of a car door, so if your passing parked cars and your keeping the correct driving position away from the cars. Should someone open their door without looking then you have a better than average chance of not taking the door off for them.
Find two reference points on the dash that matches your parked position on the left side of the road and a second reference point one metre from the curb as this will help you in the early stages of learning to drive.
Most learners feel they have more control if they keep themselves near the centre line of the road. This is very dangerous as if you meet another car coming towards you doing the same thing you may crash or have to make a dangerous steering movement.