Too + adjectives/adverb + to-infinite (negative meaning = mor/ less than what is needed) The oven is too expensive to buy. (we can´t buy it, it´s very expensive).
Adjective/adverb + enough + to-infinite/ noun + enough (positive meaning; as much as wanted/ needed) This mixer is easy enough to use. (It´s very easy to use. I can use it easily.) We have enough money to buy iron. (we can afford to buy it.)