where to use Please and where to use Kindly.

Do you mean where in the world? For example, with your teacher, at the bank, with friends?
Or do you mean where in the sentence? Beginning? Ending?

I think you mean the second one. Use please or kindly just before the main verb that carries the meaning of what you are asking for. Or use please at the end of the sentence. kindly is not often heard

In the U.S. kindly is not used much compared to please.

Also in BrE; it's more formal.

i heard that please is used with person in same level and kindly is used with the person in higher level
is this tru?

I suppose it depends on the culture of the country.

That's not the case in the UK.

Actually, now I think about it, when 'kindly' is used here, it is often in a rather haughty way. It's almost the opposite of being polite!

I know that Indian sites are using "please kindly." That, to me, seems too much, kind of a doubling/overload.

when u'll get the answer , kindly send it to ma ID*********************************** i'll really be greatfull.

Please note that we answer questions here. We don't send the answers to people.

Clive

Kindly encouraged your advisory class to watch the film.