How should a tour guide speak Buddhism?

If you don't believe in yourself and haven't studied well with your teacher, then as a tour guide, you only need to follow one principle: honesty. Don't make up what you don't know, don't say what you don't know, or explain in advance that it is a folk rumor. "Go ahead, listen." If you don't pretend to know nonsense, ignorant people won't appreciate you, and knowledgeable people will despise you.

As a professional understanding, we can treat all the people we want to talk about, whether they are laymen, monks, arhats, bodhisattvas and buddhas, as practitioners, focusing on what vows they have made, what precepts they have kept, what sects they belong to, and what contributions they have made to the spread of Buddhism and the inheritance of sects.

As a basic understanding, you can look at biographies of Buddha, popular books circulated by sectarian system, biographies of eminent monks and so on (don't look at unofficial history).

These materials are easy to find on the internet now.

In the words of Buddhists, the key is "no nonsense". For example, don't joke about "Guanyin Bodhisattva will bless the promotion and get rich, and the spirit of Earth Treasure Bodhisattva will be passed on to the ancestors, and what can be touched to make a happy marriage forever" (serious Buddhism doesn't open these businesses), which will make people laugh their teeth off in vain.