What is the best IV to buy and sell stocks and Index options?

For Stocks: Buy when IV is below 40 and sell when IV is above 40
For Index options: Buy when the IV is below 20 and sell when the IV is above 20

Is this correct?

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IMO Buy and sell decision should not be solely on IV. If IV is high and you want to short, then you are also carrying a higher risk for that premium. If the underlying set up suits you + IV is fetching a higher premium, you can short it ( and vice versa). Hope it helps

Yes, thanks. But is 40 and 20 IV correct value?

No, It is to the normal range of that particular underlying. for some stocks it will be 30 / 60.