Buenas vs Buenos

What is the difference between Buenas and Buenos? Or when should one be used vs the other?

It depends of the gender of the word, I mean, “días” is a masculine gender word and their adjective (buenos) must to be in a masculine gender too "buenos días! “Tardes” and “noches” both are femenine gender words, so their adjective must to be in the same gender “buenas tardes” / “buenas noches”

El dĂ­a / Los dĂ­as
La noche /Las noches
La tarde /Las tardes

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bueno informaciĂłn

gracias por tu ayuda!

How do I know if a word is feminine or masculine?

@spfinegan, “I’ve noticed that over time you just sort of start knowing which words are el or la because you’ve heard it enough times, but if I’m not sure I just look it up”

I completely agree. I would specially recommend reading. You see common words over and over with the apropiate article gender. Finally it becomes natural.

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it’s buenA información.

If you want to sound classy, you can also say, “Buen día.”