How to Say "let know" in Spanish
The Spanish word for “let know” is “avisar” — A1 level. This is a very common word in everyday Spanish.
Examples
Avísame cuando llegues a casa, por favor.
Let me know when you get home, please.
Tengo que avisar a mi jefe que no podré ir mañana.
I have to inform my boss that I won't be able to go tomorrow.
El banco nos avisó del cambio de horario por correo electrónico.
The bank notified us of the change in schedule via email.
Using 'a' for the Person
When you say WHO you are informing, you must use the word 'a' before the person, like saying 'to' them: 'Avise a Juan' (Inform Juan).
Using 'de' for the Topic
When you specify WHAT you are informing about, use 'de' (of/about): 'Avísame del cambio' (Let me know of the change). If you use a full sentence, use 'que': 'Avísame que vas a llegar tarde'.
Forgetting 'a' before the person
Mistake: “Avise mi madre.”
Correction: Avise a mi madre. (Spanish always needs that 'a' before a person when they receive the action.)
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