This is the 688th most frequent Spanish word.
cocina
Kitchen.
In this sentence, 'cocina' refers to the room in a house designated for cooking, which is the kitchen.
La cocina de mi abuela siempre huele deliciosa.
My grandmother's kitchen always smells delicious.
Here, 'cocina' is used as a verb for the action of cooking, indicating that Juan performs the cooking action skillfully.
Juan cocina muy bien y prepara platos increíbles.
Juan cooks very well and prepares incredible dishes.
In this case, 'cocina' refers to a style of cooking or culinary tradition, in this instance Italian cuisine.