Why spain and portugal were the first to discover new lands?

In those days, these countries were maritime states. They had a fleet and the appropriate technology. It should be noted that at that time a new type of ship was built – the caravel. It allowed you to cross wide sea areas. Thus, having a large fleet at their disposal, in which there were such ships, the Spaniards and the Portuguese were able to organize large sea expeditions. In the beginning, their main direction was India.