@ pieface
Your not entirely wrong! You have cosecha, crianza, reserva and gran reserva/ reserva especial each has more time in oak barrell and bottle. Some are aged in new/young American oak and some in French oak – which is less strong. The young American oak barrels can overpower wines though so often they’ll use a mixture of the two.
Edit- strangely some bodegas lie the oak down, once bought in, outdoors for a few years before they make them into barrels – believing that the oak takes on the flavour of the region. Not sure I’m buying that one myself though!
( I’m going to shut up now!)