Reference
Politeness
It comes from the verb form and which "you" you pick, not from piling on "please".
What it is for
- Calling one stranger "you" in the plural, to be polite
Kas te soovite teed või kohvi?
Would you like tea or coffee?
Kas te maksate sularahas või ülekandega?
Will you be paying with cash or by bank transfer?
- The "would" form, to make a request gentler
Ma tahaksin sinult midagi paluda.
I would like to ask you for something.
Tahaksin vana külmiku tasuta ära anda.
I would like to give away my old refrigerator for free.