creer
believe
credit
to believe in the truth of something; to trust
+
-er
verb suffix
Creer means 'to believe' and can be remembered by thinking of credit0 + -er1. When you trust in something0, you creer it.
verb
  1. believe
    To believe or think something is true
    Creo que va a llover mañana. // I believe it's going to rain tomorrow.