Question

What are the basic words I have to know to learn Japanese?

Answer 1

Hai. Yes. はい。

Iie. No. いいえ。

O-negai shimasu. Please. おねがいします。

Arigatō. Thank you. ありがとう

Answer 2

I recommend u to start learning the letters first. alphabets like

あいうえお
a i u e o

so on and so forth