Hi,
One main advantage of credit cards is that they usually offer you buyer protection. In other words if you buy an item on the web or via mail order, and the item fails to arrive you are covered, but with a debit card once the money has gone from your account that's it.
If you can do it always pay off your credit card balance each month as the intrerest rate on most cards is very high (25% -30%). There are many ways to use a credit card to borow money in the short term and this website is worth a good read if you plan no doing that ,also gives advice on the best cards around at the moment.
http://www.moneysavingexpert.com/cards/