Charging
recently I purchased iPhone 15pro max so, for charging my device how many watts adapter should i use?
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Your iPhone 15 Pro Max will charge at maximum of 20W, even if you use a charger that supports a higher wattage. You can also charge your iPhone 15 Pro Max with chargers that support a lower wattage than 20W.
Note that, even if you use a 20W charger, your iPhone will not always charge at 20W. Charging speeds depending on a variety of factors, including (but not limited to) temperature, battery health, state of charge, etc..
You can read more about Apple's own USB power adapters here: About Apple USB power adapters - Apple Support