Losing typed-in text irretrievably

It happens to me pretty often when I touch a key incidentally or when I
have to do something else before Send or Save. Then the text I spent long
time to type in just disappears irretrievably. In Android there was a
confirmation question before such a critical action. If such feature is
also available in iOS via some Setup option, I can not find it. But then I
am fairly new in the Apple environment. So go easy on me if I should know
this.