A boolean or a bool is a data type. Booleans are logical values. A boolean variable can have the value True or False.

i_like_pizza = True
i_like_somebody_i_hate = False
i_like_pizza and i_like_somebody_i_hate # True
i_like_pizza or i_like_somebody_i_hate # False
type(i_like_pizza) # <class 'bool'>

Try writing true with a lowecase at the beginning.

Rembember that python is a case-sensitive language.