Hola amigos!! estoy comenzando con arduino y tengo un arduino nano que tan recomendable es que le conecte 5 modulos led de 12V a un pin digital? estoy haciendo un proyecto de unas luces para ambulncia

Google translate translated that mess to:

Hello friends!! I am starting with arduino and I have an arduino nano that is so recommendable that it connects 5 led modules of 12V to a digital pin? I'm doing a project of some lights for Ambullence

I don't know what makes your Nano so recommendable, but you can NOT power 12V devices from a 5V Arduino.