Getting a ticket for the London transportation can be quite tricky for the first-time visitors. Personally, the only way I have used transportation was through an Oyster card.
If you planning to visit London for a day or two, probably getting an Oyster is not the option for you. Instead, you can pay through American Express, Master Card and Visa for contactless payment cards.
You can also get Day or Group Day travelcards or a Visitor Oyster one. When using the bus the adult fare is always £1.50. But for all the other means of transportation, there is no fixed price. The price depends on what zones you will travel from and to and at which time. Peak times in London are Monday to Friday from 06:30 to 09:30 and from 16:00 to 19:00.
Most London visitors buy an Oyster card no matter how many days their visit is, because they want to keep the card as a souvenir. Why keep a card as a souvenir? Only because is represents the rhythm and life in London. There is no Londoner that does not use the Oyster card. In case you buy one and do not need it afterwards, you can always return it and take your money back. But how does it work?
You can buy your Oyster from most metro stops. The price is £5.00 and you need to add £5.00 more, which will not be taken away from your balance. It is better if you put around £15.00 in total, since you will spend all of them. Trust me on this.
After purchasing the Oyster, you have nothing to worry about. You can go anywhere you want without worrying about tickets. Just remember to place it on the readers on the station gates before you exit. If you do not see one around. look again.
Each time you use your Oyster on the way in or out, you can always see how much you were charged and how much money you have left. Recharge your card by placing it on the charging cubic machines and once you select the amount of money you want to add, you place the card again, so that the transaction can be complete.
The most important thing you need to know about the Oyster, is the daily price capping. After using the card for about 2 days, on the third day the card will cap at some point. Based on your average use of the card, when you reach the average of the 2 previous days, you do not get charged anymore.