This is the 709th most frequent Azerbaijani word.
bəli
Yes.
In this sentence, 'bəli' is explicitly used in direct speech to signify agreement or confirmation.
Sualına bəli dedim, çünki razılaşdım.
I said 'bəli' to your question because I agreed.
Here, 'bəli' is used as an affirmative response, equivalent to 'yes' in English, to confirm a statement.
Bəli, mən bu kitabı oxuyuram.
Yes, I am reading this book.
Here, 'bəli' is employed for emphasis in confirming or emphasizing the evaluation of a proposal.