Prague Castle Area Tourist Strategy has bought a B line ticket, which is the most cost-effective. 250 kroner contains four scenic spots. It can buy tickets directly to the tourist center. It opens at 9 o'clock. It is suggested to go early. See figure 6, there is a Chinese introduction and the price can be purchased directly from the tourist center to the tourist center. There is also a coin changer, which can convert 100,200 kroner notes into 10 kroner coins. It's better to take a picture at about 8 o'clock. After all the tours are finished before noon, the number of tour groups will increase sharply around 11 o'clock. The change of guards is on time at the outermost gate. Don't go inside. 12 o'clock seems to be the best one. I recommend it.