Good to ,for,at, on的分別???

1, good to - 有利或好處: good to know/have能夠知道/擁有便很有利
2, good at - 擅長於某技能/學識: good at sports擅長體育運動
3, good on - 在某情況上有效或真確: he is good on his words口頭承諾是有效的=有誠信的人
4, good for - 保質期/對xx有益: good for 3 months有效三個月，good for your health對你健康有益

It's good to meet you.
I am good at drawing.
Milk is good for body