How do you manage your children's tantrums?

Hi! Im glad my son grew up well-behaved. He's now 9 y/o. I think nagtantrums lang sya twice nung preschool days nya. What I did is I never give whatever he wanted. And since then, I only have 3 main rules, "My child, my rules!" "You'll only get what you need, not what you want" and "Ako ang masusunod." For me, the more na nagive in ka sa bata, mas lalo sila nagiging makulit. Pero shempre, may reward naman sya. Di naman tayo ganun kastrict para di bigyan ng happiness mga bata. Yun nga lang, dapat instill mo agad sa kanila, lalo na habang wala pang laman ang tabula rasa, na hindi pwedeng sila ang nasusunod. Pero shempre momsh, iba iba tayo ng approach as a parent. Hehe.