guardar
save
guard
protect, watch over
+
-ar
verb suffix
Guardar means to save and can be remembered by thinking of guard0 (protect0) + -ar1 (verb suffix1), as saving something is like guarding or protecting it.
verb
  1. save
    To keep or store something for future use
    Debes guardar estos documentos en un lugar seguro. // You should keep these documents in a safe place.