When to use éste, ésta and esto
Éste is the Spanish word for this. You can use it when you are showing something to somebody.
Éste es mi dormitorio. This is my bedroom.
As usual in Spanish there are different words depending on the thing you're indicating. Éste goes with the masculine nouns and ésta with the feminine ones.
Ésta es la cocina. This is the kitchen.
For the plurals you use éstos and éstas.
Éstos son los dormitorios. These are the bedrooms.
Esto is used to talk about things you don't know the name of.
¿Qué es esto? What is this?