How many watts is a good amplifier?

Excuse me, I'm looking to purchase an amplifier but I'm unsure about the wattage. Could you tell me, what is considered a good wattage for an amplifier? I've heard varying opinions and I'm trying to make an informed decision. Is there a specific range that's generally recommended for home use or is it more dependent on the size of my speakers and the room I'm using it in? Any guidance you can provide would be greatly appreciated.