Well, some time traveller novels like 'A Connecticut Yankee in King Arthur's Court' show that trying to change history according to modern values can lead to chaos. The main character tries to introduce modern ideas and technology to King Arthur's time but ends up causing all sorts of problems. Other novels, such as 'The Time Traveler's Wife', don't really focus on large - scale history changing but more on how the time traveler's personal experiences in different times affect his relationships. However, in general, time traveller novels often suggest that changing history is not as straightforward as it might seem at first and can have far - reaching and unpredictable effects.
Time traveller novels deal with the concept of changing history in various ways. In 'Doomsday Book' by Connie Willis, the time travelers are very careful not to disrupt the past as they are studying it. But then there are novels where the characters are more reckless. For instance, in some stories, the time traveler might try to prevent a major disaster like in '11/22/63' but find that every action they take has unforeseen consequences that ripple through time. Some novels also explore the idea that history is so intertwined that changing one small thing can completely rewrite the future, while others may show that there are certain events that are fated to happen no matter what the time traveler does.
In many time traveller novels, changing history is a complex and often dangerous concept. For example, in '11/22/63' by Stephen King, the protagonist discovers that even small changes in the past can have huge and unexpected consequences in the future. Sometimes, the novels show that history has a kind of self - correcting mechanism, like in 'The Time Machine' where the future seems to be on a set path despite the time traveler's presence.