The following is stated in the traffic rules regarding turning on a road with one lane in each direction of travel:

When turning right, the driver shall keep the vehicle as close to the right-hand edge of the carriageway as possible.

When turning left, the driver shall drive as close to the middle of the carriageway as possible (i.e. on the left-hand side of your own lane).

In addition, you should - to clearly show your intentions and to avoid hindering other road users - seek to make the turn as sharp as possible.