Aquestion for christians: why did god created the new testament? what about the lod testament?

the new testiment is when Jesus was born and the miracles also the predictions the old testaments are just telling you what happend like with Noah, Moses, Abrahan ect. but the main reason god has made the old testaments were to analise what mistakes his peple did so we can try not to sin the same way they did incase you want to know more go to www.jw.org/es