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The Benefits/Disadvantages of using a credit card
Note: this answer is true for the UK, other places may vary. There are a couple of uses for credit cards.  The first is to use them in a revolving manner, if you pay off the bill in full every time you get one then with the vast majority of cards you will pay no interest, effecitvely delay your expenses by a month, build your credit rating and with many credit cards you can also get rewards. Generally you should wait until the bill comes to pay it off. This ensures that your usage is reported to the credit ratings agencies. In general you should not draw out cash on credit cards as there is usually a fee and unlike purchases it will start acruing interest immediately. The second is longer term borrowing. This is where you have to be careful. Firstly the "standard" rate on most credit cards is arround 20% APR which is pretty high. Secondly on many cards once you are carrying a balance any purchases start acruing interest immediately. However many credit cards offer promotional rates. In contrast to the standard rates which are an expensive way to borrow the promotional rates often allow you to borrow at 0% APR for some period. Usually when it comes to promotional rates you get the best deal by opening a new credit card and using it immediately.  Ideally you should plan to pay off the card before the 0% period ends, if you can't do that then a balance transfer may be an option but be aware than in a few years the market for credit cards may (or may not) have changed. Whatever you do you should ALWAYS make sure to pay at least the minimum payment and do so on time. Not doing so may trigger steep fees, loss of promotional interest rates. There is a site called moneysavingexpert that tracks the best deals.