Today – hoy
(Pronounced oi (like the "oi" in "oil" - the "H" is silent))
To remember that today is pronounced oi (hoy) in Spanish, use the following mnemonic:
Today we ran out of oil (hoy).

Examples of hoy (today) in a sentence
Hoy tengo una reunión importante en el trabajo.
(Today I have an important meeting at work.)
No puedo salir hoy porque estoy muy cansado.
(I can't go out today because I am very tired.)
Hoy es el cumpleaños de mi madre.
(Today is my mother's birthday.)