Many modern cars will have power steering included, and occasionally there can be a few problems that arise. If you feel your power steering becoming heavier and harder to turn then you could have a big issue on your hands.
The first thing is to check for leaks around the pump for the power steering, while the level should be between the min and the max mark. You may need to top up your power steering fluid several times to see if it is a leak or whether it just needed one top up.
Occasionally there can be loose belts that effect steering, and screechy noises will reflect a problem with the belt, and it may only need a slight adjustment. Always make sure your power steering is functioning as it should, and regular checks are ideal.