What is the best example of how an advance in the use of technology made life less difficult for paleolithic?

Knowing the use of fire

The discovery of fire had open the doors for the human being to go for more discoveries.  The fire was acted as the source of warmth, made easy to get protection from cold temperature and allowed hominids to survive in cold environments.

Discovery of the fire was a cultural advancement which allowed for human geographic dispersal, cultural modifications, and alterations to diet and behavior. Producing fire allowed the extension of human action to progress into the dark and colder hours of the evening.