Well you can try by yourself:
«Decrypt the following text. It uses the caesar cypher, "P ohcl kpzjvclylk h aybsf thyclsvbz wyvvm vm aopz, dopjo aopz thynpu pz avv uhyyvd av jvuahpu."»
And you'll get this answer:
«To decrypt the text, you need to determine the shift value used in the Caesar cipher. The Caesar cipher is a simple substitution cipher where each letter in the original message is shifted a certain number of places down the alphabet. For example, if the shift value is 2, then A would be replaced by C, B would be replaced by D, and so on.
To decrypt the message, you can try shifting the letters in the ciphertext back by different amounts until you find the shift value that produces meaningful text. Once you have determined the shift value, you can use this to decrypt the rest of the message.
Here is one possible solution:
Shift value: 7
Ciphertext: P ohcl kpzjvclylk h aybsf thyclsvbz wyvvm vm aopz, dopjo aopz thynpu pz avv uhyyvd av jvuahpu.
Plaintext: I love solving puzzles and challenges, they are so much fun.»
That is completely wrong. It should be:
«I have discovered a truly marvelous proof of this, which this margin is too narrow to contain».