Not all prequels do justice to the series they spawn from, but Better Call Saul enhances the story told in Breaking Bad — and answers several questions raised by the original AMC show. In Better Call Saul, Vince Gilligan and Peter Gould dig into the backstory of the slippery lawyer Saul Goodman (Bob Odenkirk). They simultaneously expand upon Breaking Bad's world. Many of the characters from Breaking Bad appear over the course of its prequel, giving viewers insight into what they were doing prior to Walter White's (Bryan Cranston) time as Heisenberg.

https://screenrant.com/better-call-saul-answer-breaking-bad-questions/