Checking your tyre pressure regularly is important, especially if your car has been standing still for a while. If your tyres are too soft, you use more fuel, your tyres will get warmer in use which increases the risk of a blowout and handling will be affected. A tyre that is too hard is also a problem because you will make less contact with the road and your tyres wear out much quicker.
If you don’t have your own pressure gauge you can do this at most petrol stations. First of all, you need to know what the correct tyre pressure is for your car. This is usually stated in your owner's manual, on a sticker on the inside of your door, behind the fuel filler flap or on the tyre pump itself.
Note: There may be a difference in ideal tyre pressure between the front and rear tyres. Also pressures can be shown in PSI and BAR, there is usually a converter for this on most modern gauges.