The Null Cipher is really easy to learn!
Let’s take this example:
Denver Architects Travel A lot.
To find the flag, you consider the case. Whatever number it is, is the letter you take for the flag.
In this case, you take the first letter of all of the words to find the flag.
Remember, It depends on the case!
Some words might be too small for the case, in that condition, don’t use that word!