i want to know, how do crypto exchanges list new tokens, what terms and condition or what type of document are needed to list a token . i really doesn't know anything so may be the written terms may seem off the points
You could both read up these tips and requirements on how to get listed. These are on both Binance and Kucoin for the example.
Usually these are end game CEX which you would consider for a token to get listed which it is really just that understandable that most projects would be listed out on smaller exchangers before reaching out the big ones.