Ser is used in a simple way, to talk about WHAT something is (permanent state). To describe characteristics that are an essential part of the thing we're talking about. Estar is used to talk about HOW something is, so we use it for conditions, locations, emotions, and actions (temporary states).
Eduardo ahorra dinero mensualmente para poder viajar al final del año. = Eduardo saves money monthly to be able to travel at the end of the year.
hope this helps
