That's ok dear! all is new to you here
But it's quite useful to learn this from the beginning, as plenty of nouns and adjectives switch their final letter from "a" for female to "o" for male:
-Maestra (female teacher) -Maestro (male teacher)
-Niña (female child) -Niño (male child)
-Pequeña (small, used for female ppl or objects) -Pequeño (small, used for male ppl or objects)
-Roja (red, used for female objects) -Rojo (red, used for male objects)