Turning toward north from an easterly or westerly heading implies a 90-degree angular turn to the correct direction based on Earth's cardinal points, where east and west are defined by Earth's rotation.
When turning toward north from an easterly or westerly heading, you would be orienting yourself in the cardinal direction that is opposite to south. On Earth, directions such as east and west are defined by the planet's rotation, with east being the direction towards which Earth rotates and west being the opposite.
If you were, for instance, heading due west and then decide to turn north, you would be initiating a 90-degree turn to your right when facing west. Conversely, from an easterly heading, a turn to the north would involve a 90-degree turn to the left.
Let's apply this knowledge using an airplane scenario. If an airplane starts from an east or west direction and turns towards the north, it does not move relative to the ground in the direction it originally pointed, but rather in the direction of its total velocity, which now has been altered to point north. This physical behavior reflects the fundamental principles of navigation and motion.