The Advice to the Kalamas is a traditional Sutra (teaching) of the Buddha.
First, understand it is essential in Buddhist teachings to doubt. Doubt and test for yourself. The Kalama Sutta (or Sutra) discusses how you should approach any teaching; with curiosity, non attachment and a sense to test it.
The process of not taking the word of the teacher, not adhering to a teaching because it was written (in a holy text), it is tradition, elders say so, the government says so, even on your own intellect. Learn and test the lesson for yourself, discuss it, practice it. If it works, it’s for you….
“Absorb what is useful” Bruce Lee